A charged particle is moving perpendicular to a uniform magnetic field, the radius of its motion given by r = mv/Bq. The speed of the particle is tripled. The particles time to complete one loop
1.is divided by three.
2.triples.
3.stays the same.
4.changes in ways which cannot be determined with the information given.
[Ques. 2] A charged particle is moving perpendicular to a uniform magnetic field. The radius of its path can be decreased most by
1.decreasing the magnitude of the magnetic field.
2.increasing its velocity.
3.decreasing its velocity and increasing the magnitude of the magnetic field.
4.increasing its velocity and decreasing the magnitude of the magnetic field.
[Ques. 3] A circular current loop with radius r has a magnetic dipole moment . To gain the greatest increase in its magnitude, you could
1.double the radius and maintain the current.
2.double the radius and halve the current.
3.halve the radius and double the current.
4.double the current and maintain the radius.
[Ques. 4] The radius of the path of a charged particle moving perpendicular to a uniform magnetic field is given by r = mv/Bq. What is the time, T, it takes for this particle to complete one loop around its path?
1. Bq/2pm
2. 2pm/Bq
3. Bqr
4. Additional information must be given.
[Ques. 5] Which of the following increases the magnetic moment of a rectangular coil the most?
1.doubling the coil's current and its number of turns
2.doubling the coil's area and doubling the magnetic field in which the loop is placed
3.doubling the magnetic field in which the coil is placed and doubling the angle between the magnetic field and the plane of the loop
4.All of these choices increase the magnetic moment by a factor of 4, thus they are all the most.
[Ques. 6] A wire in the plane of the paper carries a current clockwise through a loop. A magnetic field points out of the page. In what direction is a force being exerted by the magnetic field at the rightmost point on the loop?
1.leftward
2.into the page
3.toward the bottom of the page
4.out of the page
[Ques. 7] Two parallel wires carry currents in the same direction and exert a force on each of magnitude F for each meter of length. One of the currents is now reversed in direction and doubled in magnitude. What are the resulting magnitude for the force per meter of length and its direction relative to the wires?
1.2F, attractive
2.2F, repulsive
3.4F, attractive
4.4F, repulsive
[Ques. 8] A particle of positive charge q travels with velocity v towards the top of the page. The magnetic field present, B, points rightward. The force
1.points leftward.
2.points into the page.
3.points toward the bottom of the page.
4.points out of the page.
[Ques. 9] A particle of charge q travels with velocity v in the same direction as the magnetic field, B. What is the force exerted on the charge?
1. qvB, in the direction of the magnetic field
2. qvB, in the direction opposite that of the magnetic field
3. qvB, in a direction perpendicular to the magnetic field and the velocity
4. zero
[Ques. 10] A charged particle q, traveling through a magnetic field, has the force FB acting upon it. Another particle with charge equals to 2q will have the same force acting upon it if
1.it moves at half the velocity in the opposite direction.
2.it moves at twice the velocity in the opposite direction.
3.it moves at half the velocity in the same direction.
4.it moves at twice the velocity in the same direction.
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