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Laura L. Lang. Created for Albert.io. Copyright 2016. All rights reserved.

A battery is placed in a holder that will allow it to rotate freely. A loop of wire is attached to the two terminals of the battery and then placed in a magnetic field between a north pole of one bar magnet and the south pole of a second magnet as shown above. The two sections of the wire (labeled $A$ and $B$) that are in the magnetic field are parallel to each other as well as the ends of bar magnets and are perpendicular to the magnetic field between the two magnets.

Assume you are above the equipment looking down directly at the two terminals on the top of the battery as shown in the diagram below. Note that the diagrams are not drawn to scale.

Laura L. Lang. Created for Albert.io. Copyright 2016. All rights reserved.

Which of the following statements best describe the initial motion of the battery due to the resulting magnetic force on the sections of the wire in the magnetic field?

A

The force on Section A will be down and the force on Section B will up causing the battery to turn counter-clockwise.

B

The force on Section A will be up and the force on Section B will be down causing the battery to turn clockwise.

C

The force on both Section A and B will be down so the battery will move down.

D

The magnetic force acting on Section A will be equal in magnitude but opposite in direction to the force on Section B. The vector sum of these two forces will be zero so the battery will not move.

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