Physics

The windings of a DC motor have a resistance of 6.0 Ω. The motor operates on 120. V AC, and when ...

The windings of a DC motor have a resistance of 6.0 Ω. The motor operates on 120. V AC, and when ...

The windings of a DC motor have a resistance of 6.0 Ω. The motor operates
on 120. V AC, and when running at full speed it generates a back emf of 105. V.
(a)   What is the starting current of the motor?
(b)   What current does the motor d

tankster   101   1 Reply

mtown88

An AC generator rotating at 60. Hertz in a 300. Gauss field has 1000. turns and produces an rms ...

An AC generator rotating at 60. Hertz in a 300. Gauss field has 1000. turns and produces an rms ...

An AC generator rotating at 60. Hertz in a 300. Gauss field has 1000. turns and produces an rms voltage of 150. volts and an rms current of 70. Amperes.
(a)   What is the peak current?
(b)   What is the area of each turn in the coil?

tankster   73   1 Reply

longhair

A 60. Hz AC generator produces a maximum emf of 170. V. What is the value of the emf 0.025 s after ...

A 60. Hz AC generator produces a maximum emf of 170. V. What is the value of the emf 0.025 s after ...

A 60. Hz AC generator produces a maximum emf of 170. V. What is the value of the emf 0.025 s after it has reached its maximum value?

Northa   104   1 Reply

longhair

A coil of 160 turns and area 0.20 m2 is placed with its axis parallel to a magnetic field of 0.40 T. ...

A coil of 160 turns and area 0.20 m2 is placed with its axis parallel to a magnetic field of 0.40 T. ...

A coil of 160 turns and area 0.20 m2 is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 Ω, at w

Brelou   101   1 Reply

Raj.S

A metal airplane flies horizontally at 200. m/s where the Earth's magnetic field is vertical and is ...

A metal airplane flies horizontally at 200. m/s where the Earth's magnetic field is vertical and is ...

A metal airplane flies horizontally at 200. m/s where the Earth's magnetic field
is vertical and is 45.0 μT. If the wingspan is 25.0 meters:
(a)   what emf is induced across the wings?
(b)   what wingspan would produce 1.0 volt emf?

Brelou   163   1 Reply

Raj.S

A transformer is based on a principle of

A transformer is based on a principle of

A transformer is based on a principle of
A) self inductance.
B) direct current.
C) alternating current.
D) mutual inductance.
E) energy conservation.

tankster   101   1 Reply

longhair

Which one of the following is the correct unit for the time constant of an RL circuit?

Which one of the following is the correct unit for the time constant of an RL circuit?

Which one of the following is the correct unit for the time constant of an RL circuit?
A) H/Ω
B) (V∙s)/(A∙Ω)
C) s
D) All of the answers are correct.
E) None of the answers is correct.

tankster   83   1 Reply

Raj.S

How would the self-inductance, L, of a coil change if you would increase its radius by a factor of ...

How would the self-inductance, L, of a coil change if you would increase its radius by a factor of ...

How would the self-inductance, L, of a coil change if you would increase its radius by a factor of two and increase its length by a factor of two?
A) L would not change.
B) L would be doubled.
C) L would be quadrupled.
D) L would

Brelou   99   1 Reply

Raj.S

Which of the following is true for the SI units of self-inductance?

Which of the following is true for the SI units of self-inductance?

Which of the following is true for the SI units of self-inductance?
A) Ω∙s
B) henry (H)
C) (J∙s)/(C∙A)
D) All are correct answers.
E) None are correct answers.

Brelou   154   1 Reply

mtown88

The number of turns in the coil of a generator is reduced by a factor of 2 and at the same time it ...

The number of turns in the coil of a generator is reduced by a factor of 2 and at the same time it ...

The number of turns in the coil of a generator is reduced by a factor of 2 and at the same time it is rotated twice as fast keeping other factors constant. What happens to the value of the maximum induced emf?
A) It is reduced by a factor of 2.

Brelou   116   1 Reply

Raj.S

The coil of a generator is rotated twice as fast keeping all other factors constant. What happens to ...

The coil of a generator is rotated twice as fast keeping all other factors constant. What happens to ...

The coil of a generator is rotated twice as fast keeping all other factors constant. What happens to the value of the maximum induced emf?
A) It stays the same.
B) It is reduced by a factor of 2.
C) It is increased by a factor of 2.

Northa   111   1 Reply

Raj.S

A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its ...

A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its ...

A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its south pole downward, vertically above the center of the coil. The magnet is kept stationary with respect to the coil. As viewed from above, you can say

Brelou   100   1 Reply

Raj.S

A rectangular coil lies flat on a horizontal surface. A bar magnet is held above the center of the ...

A rectangular coil lies flat on a horizontal surface. A bar magnet is held above the center of the ...

A rectangular coil lies flat on a horizontal surface. A bar magnet is held above the center of the coil with its north pole pointing down. What is the direction of the induced current in the coil?
A) There is no current in the coil.
B) cloc

Northa   140   1 Reply

longhair

The magnetic field and the number of turns of a coil of wire are doubled, while its area is reduced ...

The magnetic field and the number of turns of a coil of wire are doubled, while its area is reduced ...

The magnetic field and the number of turns of a coil of wire are doubled, while its area is reduced by a factor of 2. Assuming that all the other parameters remain the same, what happens to the induced emf in that coil of wire?
A) It is doubled.

tankster   104   1 Reply

mtown88

The magnetic field and the number of turns in a coil of wire are doubled. Assuming that all the ...

The magnetic field and the number of turns in a coil of wire are doubled. Assuming that all the ...

The magnetic field and the number of turns in a coil of wire are doubled. Assuming that all the other parameters remain the same, what happens to the induced emf in that coil of wire?
A) It is doubled.
B) It is reduced by a factor of 2.

Northa   108   1 Reply

mtown88

The area and the number of turns in a loop of wire are doubled. Assuming that all the other ...

The area and the number of turns in a loop of wire are doubled. Assuming that all the other ...

The area and the number of turns in a loop of wire are doubled. Assuming that all the other parameters remain the same, what happens to the induced emf in that loop of wire?
A) It is doubled.
B) It is reduced by a factor of 2.
C) It is

tankster   87   1 Reply

mtown88

The area of a loop of wire is reduced by a factor of 2 while the rate of change of magnetic field ...

The area of a loop of wire is reduced by a factor of 2 while the rate of change of magnetic field ...

The area of a loop of wire is reduced by a factor of 2 while the rate of change of magnetic field applied is doubled. What happens to the induced emf in that loop of wire?
A) It is doubled.
B) It is reduced by a factor of 2.
C) It is r

Northa   112   1 Reply

longhair

If the rate of change of the magnetic field applied to a loop of wire is doubled, what happens to ...

If the rate of change of the magnetic field applied to a loop of wire is doubled, what happens to ...

If the rate of change of the magnetic field applied to a loop of wire is doubled, what happens to the induced emf in that loop assuming all the other parameters remain unchanged?
A) It is doubled.
B) It stays the same.
C) It is reduced

Brelou   105   1 Reply

Raj.S

If the strength of the magnetic field applied to a loop of wire is doubled, what happens to the ...

If the strength of the magnetic field applied to a loop of wire is doubled, what happens to the ...

If the strength of the magnetic field applied to a loop of wire is doubled, what happens to the induced emf in that loop assuming all the other parameters remain unchanged?
A) It stays the same.
B) It is doubled.
C) It is tripled.

Brelou   106   1 Reply

Raj.S

For the maximum induced emf in the coil of a generator, the term sin ωt has a value of one.

For the maximum induced emf in the coil of a generator, the term sin ωt has a value of one.

For the maximum induced emf in the coil of a generator, the term sin ωt has a value of one.

tankster   138   1 Reply

mtown88

For the maximum induced emf in the coil of a generator, the term sin ωt has a value of zero.

For the maximum induced emf in the coil of a generator, the term sin ωt has a value of zero.

For the maximum induced emf in the coil of a generator, the term sin ωt has a value of zero.

tankster   100   1 Reply

Raj.S

The emf in a conducting rod of length L moving perpendicular to a magnetic field is directly ...

The emf in a conducting rod of length L moving perpendicular to a magnetic field is directly ...

The emf in a conducting rod of length L moving perpendicular to a magnetic field is directly proportional to the speed of the rod.

Brelou   139   1 Reply

mtown88

The shape of the wire determines the direction of the induced current in a conducting loop of wire.

The shape of the wire determines the direction of the induced current in a conducting loop of wire.

The shape of the wire determines the direction of the induced current in a conducting loop of wire.

Brelou   155   1 Reply

Raj.S

A constant magnetic flux through a closed loop of wire induces an emf in that loop.

A constant magnetic flux through a closed loop of wire induces an emf in that loop.

A constant magnetic flux through a closed loop of wire induces an emf in that loop.

Northa   121   1 Reply

longhair

A changing magnetic flux through a closed loop of wire induces an emf in that loop.

A changing magnetic flux through a closed loop of wire induces an emf in that loop.

A changing magnetic flux through a closed loop of wire induces an emf in that loop.

tankster   140   1 Reply

Raj.S

An emf is induced in a wire by changing the current in a nearby wire.

An emf is induced in a wire by changing the current in a nearby wire.

An emf is induced in a wire by changing the current in a nearby wire.

tankster   97   1 Reply

longhair

An emf is induced in a wire by changing the current in that wire.

An emf is induced in a wire by changing the current in that wire.

An emf is induced in a wire by changing the current in that wire.

tankster   107   1 Reply

Raj.S

An emf is induced in a wire by keeping a stationary magnet near the wire.

An emf is induced in a wire by keeping a stationary magnet near the wire.

An emf is induced in a wire by keeping a stationary magnet near the wire.

tankster   108   1 Reply

mtown88

There is an induced emf in a wire that is moving parallel to a magnetic field if the wire is moving ...

There is an induced emf in a wire that is moving parallel to a magnetic field if the wire is moving ...

There is an induced emf in a wire that is moving parallel to a magnetic field if the wire is moving in the opposite direction to that of the magnetic field.

tankster   80   1 Reply

Raj.S

There is no induced emf in a wire that is moving parallel to a magnetic field if the wire is moving ...

There is no induced emf in a wire that is moving parallel to a magnetic field if the wire is moving ...

There is no induced emf in a wire that is moving parallel to a magnetic field if the wire is moving in the direction of the magnetic field.

Brelou   90   1 Reply

mtown88

A solenoid with a certain number of turns N and carrying a current of 2.000 A has a length of 34.00 ...

A solenoid with a certain number of turns N and carrying a current of 2.000 A has a length of 34.00 ...

A solenoid with a certain number of turns N and carrying a current of 2.000 A has a length of 34.00 cm. If the magnitude of the magnetic field generated at the center of the solenoid is 9.000 mT, what is the value of N?
A) 860.0
B) 1591

Brelou   125   1 Reply

longhair

What is the magnetic field at the center of a circular loop of wire of radius 4.0 cm when a current ...

What is the magnetic field at the center of a circular loop of wire of radius 4.0 cm when a current ...

What is the magnetic field at the center of a circular loop of wire of radius 4.0 cm when a current of 2.0 A flows in the wire?
A) 1.3 × 10-6 T
B) 3.1 × 10-6 T
C) 1.3 × 10-5 T
D) 3.1 × 10-5 T
E) 0 T

Brelou   150   1 Reply

longhair

A solenoid of 200 turns carrying a current of 2 A has a length of 25 cm. What is the magnitude of ...

A solenoid of 200 turns carrying a current of 2 A has a length of 25 cm. What is the magnitude of ...

A solenoid of 200 turns carrying a current of 2 A has a length of 25 cm. What is the magnitude of the magnetic field at the center of the solenoid?
A) 2 mT
B) 3 mT
C) 4 mT
D) 5 mT
E) 6 mT

Brelou   126   1 Reply

longhair

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a ...

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a ...

A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid?
A) 16 mT
B) 4.9 mT
C) 15 mT
D) 6.0 mT

tankster   280   1 Reply

longhair

Four long parallel wires each carry 2.0 A in the same direction. They are parallel to the z-axis, ...

Four long parallel wires each carry 2.0 A in the same direction. They are parallel to the z-axis, ...

Four long parallel wires each carry 2.0 A in the same direction.  They are parallel to the z-axis, and they pass through the corners of a square of side 4.0 cm positioned in the x-y plane.  What magnetic field does one of the wires experien

tankster   219   1 Reply

longhair

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are ...

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are ...

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.  The wires are separated by 0.20 m.  At what point between the two wires are the contributions from the two wires the same?
A) 0.040 m from the 20 A wire

Brelou   108   1 Reply

mtown88

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are ...

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are ...

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions.  The wires are separated by 0.20 m.  What is the magnetic field midway between the two wires?
A) 1.0 × 10-5 T
B) 2.0 × 10-5 T
C) 3.0 × 10-5 T

Northa   116   1 Reply

longhair

Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction. The wires are ...

Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction. The wires are ...

Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction.  The wires are separated by 0.30 m.  Find the magnetic force per unit length between the two wires.
A) 2.7 × 10-5 N repulsive
B) 7.2 × 10-5 N rep

Brelou   112   1 Reply

longhair

The magnetic field at a certain distance from a wire carrying 2-A current is 4 μT. What will be the ...

The magnetic field at a certain distance from a wire carrying 2-A current is 4 μT. What will be the ...

The magnetic field at a certain distance from a wire carrying 2-A current is 4 μT. What will be the magnetic field if the current in the wire is doubled?
A) 2 μT
B) 4 μT
C) 6 μT
D) 8 μT
E) 10 μT

Northa   77   1 Reply

Raj.S

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

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

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

tankster   157   1 Reply

mtown88