Two thin long, parallel wires, separated by a distance 'd' carry a current of 'i' in the same direction. They will

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attract each other with a force of

\frac{μ_{0} i^{2}}{(2 π d^{2})}

repel each other with a force of

\frac{μ_{0} i^{2}}{(2 π d)}

repel each other with a force of

\frac{μ_{0} i^{2}}{(2 π d^{2})}

attract each other with a force of

\frac{μ_{0} i^{2}}{(2 π d)}

answer is B.

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Detailed Solution

The force for unit length between the two wires is

$\frac{F}{l} = \frac{μ_{0}}{4 π} . \frac{2 i^{2}}{d}$

$= \frac{μ_{0} i^{2}}{2 π d}$

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