Physics

An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 ...

An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 ...

An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T.  What is the magnitude of the magnetic force exerted on the electron? (e = 1.60 × 10-19 C)
A) 4.8 × 10-14 N
B) 1.9 × 10-15 N
C) 5

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A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 ...

A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 ...

A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude of the magnetic force exerted on the proton? (e = 1.60 × 10-19 C)
A) 8.0 × 10-15 N
B) 3

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A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to ...

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to ...

A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that is exerted on the proton? (e = 1.60 × 10-19 C)
A) 0 N
B) 3.4 × 10-

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A proton travels at a speed of 5.0 × 107 m/s through a 1.0-T field. What is the magnitude of the ...

A proton travels at a speed of 5.0 × 107 m/s through a 1.0-T field. What is the magnitude of the ...

A proton travels at a speed of 5.0 × 107 m/s through a 1.0-T   field.  What is the magnitude of the magnetic force exerted by the field on the proton if the angle between the proton's velocity and the   field vector is 30°? (e = 1

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An electron traveling toward the magnetic north with speed 400 km/s enters a region where Earth’s ...

An electron traveling toward the magnetic north with speed 400 km/s enters a region where Earth’s ...

An electron traveling toward the magnetic north with speed 400 km/s enters a region where Earth’s   field has the magnitude 5.0  × 10-5 T and is directed downward at 45° below horizontal. What magnitude magnetic force is exerted on the elec

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An electron moves with a speed of 5.0 × 104 m/s perpendicular to a uniform field of magnitude ...

An electron moves with a speed of 5.0 × 104 m/s perpendicular to a uniform field of magnitude ...

An electron moves with a speed of 5.0 × 104 m/s perpendicular to a uniform   field of magnitude 0.20 T.  What is the magnitude of the magnetic force exerted on the electron by the field? (e = 1.60 × 10-19 C)
A) 4.4 × 10-14 N
B) 1.

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A geophysicist measures the magnetic force exerted on a proton that is moving vertically downward at ...

A geophysicist measures the magnetic force exerted on a proton that is moving vertically downward at ...

A geophysicist measures the magnetic force exerted on a proton that is moving vertically downward at a point 1.996 km/s at Earth’s equator. At that location, Earth’s   field is horizontal and has a magnitude of 0.40 × 10-4 T. What are the magnit

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A proton moving at 5.0 × 104 m/s horizontally enters a region where a field of 0.12 T is ...

A proton moving at 5.0 × 104 m/s horizontally enters a region where a field of 0.12 T is ...

A proton moving at 5.0  × 104 m/s horizontally enters a region where a   field of 0.12 T is present, directed vertically downward. What magnitude force acts on the proton due to this field?
(e = 1.60 × 10-19 C)

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Consider two current-carrying circular loops. Both are made from one strand of wire and both carry ...

Consider two current-carrying circular loops. Both are made from one strand of wire and both carry ...

Consider two current-carrying circular loops.  Both are made from one strand of wire and both carry the same current, but one has twice the radius of the other.  If the   field at the center of the smaller loop is  1, what is the&

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A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the ...

A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the ...

A current-carrying loop of wire lies flat on a horizontal tabletop.  When viewed from above, the current through the loop is in a counterclockwise sense.  For points on the tabletop inside the loop, the   field lines caused by this cur

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A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the ...

A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the ...

A current-carrying loop of wire lies flat on a horizontal tabletop.  When viewed from above, the direction of the current around the loop is in a counterclockwise sense.  For points on the tabletop outside the loop, the   field lines c

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A horizontal wire carries a current straight toward you. From your point of view, the field ...

A horizontal wire carries a current straight toward you. From your point of view, the field ...

A horizontal wire carries a current straight toward you.  From your point of view, the   field caused by this current
A) points directly away from you.
B) points to the left.
C) circles the wire in a clockwise direction.

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Which one of the following statements is correct?

Which one of the following statements is correct?

Which one of the following statements is correct?
A) When a current-carrying wire is in your right hand, with your thumb in the direction of the current, your fingers point opposite to the direction of the   field lines.
B) When a curr

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The field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is the ...

The field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is the ...

The   field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is the   field at a distance of 1 cm from this wire?
A) 2 μT
B) 4 μT
C) 6 μT
D) 8 μT
E) 10 μT

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The field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is the ...

The field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is the ...

The   field at a distance of 2 cm from a long straight current-carrying wire is 4 μT. What is the   field at a distance of 4 cm from this wire?
A) 2 μT
B) 4 μT
C) 6 μT
D) 8 μT
E) 10 μT

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A long, straight, horizontal wire carries current toward the east. An electron moves toward the ...

A long, straight, horizontal wire carries current toward the east. An electron moves toward the ...

A long, straight, horizontal wire carries current toward the east.  An electron moves toward the east alongside and just south of the wire.  What is the direction of the magnetic force exerted on the electron?
A) toward the north

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A long, straight, horizontal wire carries current toward the east. A proton moves toward the east ...

A long, straight, horizontal wire carries current toward the east. A proton moves toward the east ...

A long, straight, horizontal wire carries current toward the east.  A proton moves toward the east alongside and just south of the wire.  What is the direction of the magnetic force exerted on the proton?
A) toward the north
B) to

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Two long parallel wires placed side-by-side on a horizontal table carry identical current straight ...

Two long parallel wires placed side-by-side on a horizontal table carry identical current straight ...

Two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you.  From your point of view, the   field at a point exactly between the two wires
A) points upward.
B) points downward.

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Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in ...

Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in ...

Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions.  The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you

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The maximum torque exerted on a flat current-carrying loop occurs when the angle between the plane ...

The maximum torque exerted on a flat current-carrying loop occurs when the angle between the plane ...

The maximum torque exerted on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the   field vector is
A) 0°
B) 45°
C) 90°
D) 135°

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Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current ...

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current ...

Two long parallel wires are placed side-by-side on a horizontal table.  If the wires carry current in opposite directions,
A) one wire is lifted slightly while the other wire is forced downward against the table's surface.
B) both

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Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current ...

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current ...

Two long parallel wires are placed side-by-side on a horizontal table.  If the wires carry current in the same direction,
A) one wire is lifted slightly while the other wire is forced downward against the table's surface.
B) both

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A vertical wire carries a current straight up in a region where the field vector points toward the ...

A vertical wire carries a current straight up in a region where the field vector points toward the ...

A vertical wire carries a current straight up in a region where the   field vector points toward the north.  What is the direction of the magnetic force exerted on this wire?
A) downward
B) toward the north
C) toward the east

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A wire is carrying current vertically downward. What is the direction of the force exerted on this ...

A wire is carrying current vertically downward. What is the direction of the force exerted on this ...

A wire is carrying current vertically downward. What is the direction of the force exerted on this wire due to Earth's magnetic field?
A) horizontally towards the north
B) horizontally towards the south
C) horizontally towards the

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A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field lines ...

A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field lines ...

A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the   field lines and takes time T for each circle. If the proton's speed tripled, what would now be its time to go around each circle?
A) 9T
B) 3T

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A particle carrying a charge of +e travels in a circular path of radius R in a uniform magnetic ...

A particle carrying a charge of +e travels in a circular path of radius R in a uniform magnetic ...

A particle carrying a charge of +e travels in a circular path of radius R in a uniform magnetic field.  If instead the particle carried a charge of +2e, the radius of the circular path would have been
A) 2R.
B) 4R.
C) 8R.
D)

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A charged particle is observed traveling in a circular path of radius R in a uniform magnetic field. ...

A charged particle is observed traveling in a circular path of radius R in a uniform magnetic field. ...

A charged particle is observed traveling in a circular path of radius R in a uniform magnetic field.  If the particle were traveling twice as fast, the radius of the circular path would be
A) 2R.
B) 4R.
C) 8R.
D) R/2.
E)

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A charged particle is injected into a uniform magnetic field such that its velocity vector is ...

A charged particle is injected into a uniform magnetic field such that its velocity vector is ...

A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the   field lines.  Ignoring the force that Earth exerts on the particle, the particle will
A) move in a straight line.

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A negatively-charged particle moves across a constant uniform field that is perpendicular to the ...

A negatively-charged particle moves across a constant uniform field that is perpendicular to the ...

A negatively-charged particle moves across a constant uniform   field that is perpendicular to the velocity of the particle.  The magnetic force exerted on this particle
A) causes the particle to speed up.
B) causes the particle t

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A charged particle moves with a constant speed through a region where a uniform magnetic field is ...

A charged particle moves with a constant speed through a region where a uniform magnetic field is ...

A charged particle moves with a constant speed through a region where a uniform magnetic field is present.  If the   field points straight upward, the magnetic force exerted on this particle will be strongest when the particle moves
A)

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We observe that there is no magnetic force exerted on a moving charged particle. From this we can ...

We observe that there is no magnetic force exerted on a moving charged particle. From this we can ...

We observe that there is no magnetic force exerted on a moving charged particle.  From this we can definitely conclude that
A) no magnetic field exists in that region of space.
B) the particle must be moving parallel to the   fiel

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If a calculated quantity has units of T ∙ m/A, that quantity could be

If a calculated quantity has units of T ∙ m/A, that quantity could be

If a calculated quantity has units of T ∙ m/A, that quantity could be
A) an   field.
B) an electric potential.
C) μ0.
D) a   field.
E) a magnetic torque.

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A proton is to orbit Earth at the equator using Earth's magnetic field to exert part of the ...

A proton is to orbit Earth at the equator using Earth's magnetic field to exert part of the ...

A proton is to orbit Earth at the equator using Earth's magnetic field to exert part of the necessary radial component of the sum of the forces. In what direction should the proton move?
A) upward
B) northward
C) southward
D)

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A charged particle moving along the +x-axis enters a uniform field pointing along the +z-axis. A ...

A charged particle moving along the +x-axis enters a uniform field pointing along the +z-axis. A ...

A charged particle moving along the +x-axis enters a uniform   field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity. What is the directio

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A charged particle moving along the +x-axis enters a uniform field pointing along the +z-axis. ...

A charged particle moving along the +x-axis enters a uniform field pointing along the +z-axis. ...

A charged particle moving along the +x-axis enters a uniform   field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?
A) positive

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A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves ...

A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves ...

A proton, moving west, enters a magnetic field. Because of this magnetic field the proton curves upward. We may conclude that the   field must have a component
A) towards the west.
B) towards the east.
C) towards the south.
D

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An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. ...

An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. ...

An electron, moving west, enters a magnetic field. Because of this field the electron curves upward. We may conclude that the   field must have a component
A) towards the north.
B) towards the south.
C) upward.
D) downward.

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A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. ...

A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. ...

A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the  field must have a component
A) downward.
B) upward.
C) towards the east.
D) towards the west.

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An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic ...

An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic ...

An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the   field must have a component
A) along the +z-axis
B) along the -z-axis
C) along the -x-

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When a charged particle is moving in a static uniform magnetic field

When a charged particle is moving in a static uniform magnetic field

When a charged particle is moving in a static uniform magnetic field
A) there will always be a magnetic force exerted on it, regardless of its direction of motion.
B) there may be a magnetic force exerted on it which will cause its speed to

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