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AP® Physics C: E & M

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Moderate

Currents in the Opposite Directions

APPHEM-T4RWKQ

Two long, straight wires have currents flowing in opposite directions as shown in the diagram below.

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If the amount of current in each wire is equal, at which point or points could the magnetic field be zero?

A

A only.

B

A and B only.

C

C only.

D

D and E only.

E

It is not possible for the magnetic field to be zero at any of these points.