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Q.

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current ‘I’ along the same direction is shown in Fig. Magnitude of force per unit length on the middle wire ‘B’ is given by:

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a

μ0i22πd

b

μ0i22πd

c

2μ0i2πd

d

2μ0i2πd

answer is A.

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Detailed Solution

At B, mag field (B) =BA2+BC2
=2μ0i2πd=μ0i2πd

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