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Magnetic Fields Between Opposing Currents

APPHEM-FYOKNB

A proton of charge $\mathit{e}$ moving at speed $\mathit{v_0}$ is placed midway between two parallel wires a distance $\mathit{a}$ apart, each carrying current $\mathit{I}$ in opposite directions.

The force on the proton is:

A

$0$

B

$\mathit{ev_0\frac{\mu_{0}I}{2{\pi} a}}$

C

$\mathit{ev_0 \frac{\mu_0I}{{2\pi (2a)}}}$

D

$\mathit{ev_0 \frac{\mu_{0}I}{2{\pi}\frac{a}{2}}}$

E

Unable to be determined