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Q.

Two long parallel wires carry equal current in the same direction. The length of each wire is l and the distance between them is d. Force acting on each wire

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a

μ0i2l2πd

b

μ0il2πd2

c

μ0i2l24πd2

d

μ0i2l4πd2

answer is A.

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Detailed Solution

Force exerted by one wire on unit length of the other=μ0i1i22πdIf l be the length of the wire, thenFm=μ0i1i2l2πd=μ0li22πd ∵i1=i2=i
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Two long parallel wires carry equal current in the same direction. The length of each wire is l and the distance between them is d. Force acting on each wire