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Q.

Two long straight parallel wires separated by a distance, carrying equal currents exert a force F per unit length on each other. If the distance of separation is halved and the current in each doubled, the force per unit length between them will be

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a

F4

b

F8

c

8F

d

4F

answer is B.

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Detailed Solution

F=μ0i1i2l2πr;Fαi1i2r;FF=i2i2×r2r
F' = 8F

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