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Capacitance of Parallel Plate Capacitor

A long parall...

Question

A long parallel straight conductors carry $i_{1}$ and $i_{2} (i_{1} > i_{2})$ . When the currents are in same direction, the magnetic field at a point midway between the wires is $20 μ T$ . If the direction of $i_{2}$ is reversed, the field becomes $50 μ T .$ The ratio of the current $i_{1} / i_{2}$ is:

A

\frac{5}{2}

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B

\frac{7}{3}

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C

\frac{4}{3}

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D

\frac{5}{3}

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Solution

The correct option is A $\frac{5}{2}$

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