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AP® Physics C: E & M

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Moderate

Increasing Force between Two Current Carrying Wires

APPHEM-BNDKFE

Two wires carrying current in opposite directions are placed a distance $\mathit{a} $ apart.

Which of the following will cause the greatest increase in the magnitude of the force between the wires?

A

Doubling the current in one wire.

B

Doubling the current in both wires.

C

Doubling the distance between the wires to $2\mathit{a}$.

D

Decreasing the distance between the wires to $\mathit{\cfrac{a}{2}}$.

E

Running the currents in the same direction.