Question

The magnitude of force per unit length on a wire carrying current at O due to two semi infinite wires as shown in figure, (if the distance between the long parallel segments of the wire being equal to and current in them is ) is:

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A

B

C

D

Hard
Solution
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Correct option is A)

Net Magnetic field at point O due to both the wires shall be
   along

 along

Now,
Where, is along
Therefore,   along

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