1. Consider a charged particle that follows the trajectory shown from a point A
ID: 3901691 • Letter: 1
Question
1. Consider a charged particle that follows the trajectory shown from a point A to a point B in a region where there is both an electric and a magnetic field. At A the particle has a kinetic energy of 100microJ, at B it has a kinetic energy of 50microJ. The work done by the electric field on the particle as it moves from A to B is:
This cannot be determined without knowing the details of both the electric and magnetic fields
50microJ
-50microJ
This cannot be determined without knowing the details of the electric field
This cannot be determined without knowing the details of the magnetic field
C
D
A
E
B
3.Two points A and B are connected (in turn) by the three different wires labeled I to III as shown below. A uniform magnetic field points into the page. If each of the different wires carries the same current i directed as shown, which wire has the greatest resultant magnetic force acting on it?
They all experience the same magnetic force
More detailed information concerning the geometrical shape and the length of the wires is required.
III
I
II
4. Which of the following statements is/are true?
(I) The magnetic force on a moving charged particle is always perpendicular to the magnetic field.
(II) A current carrying loop in a magnetic field behaves like a small magnet.
(III) The period of a particle executing uniform circular motion in a plane perpendicular to a uniform magnetic field is proportional to the radius of the circle.
5. Consider a rectangular loop of wire with sides a, b that lies in the plane of the paper as shown. If the loop sits in a uniform magnetic field directed into the plane of the paper and carries a current I in the direction shown, we can conclude that:
The loop experiences both a net torque and a net translational force.
The loop experiences a net translational force.
This cannot be determined without knowing the ratio of the lengths of the sides, a/b.
The loop experiences a net torque.
The loop experiences neither a net torque nor a net translational force.
Explanation / Answer
1) -50 microJ
2) D
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