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Q.

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

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a

repel each other with a force  μ0i2/2πd2

b

attract each other with a force of μ0i2/2πd2

c

repel each other with a force of μ0i2/2πd2

d

attract each other with a force μ0i2/(2πd)

answer is D.

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Detailed Solution

See fig. So, the two wires will attract each otherwhere l is the length of the wire. Fl=iB=iμ0i2πd=μ0i22πdThe force will be attractive.
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Two thin long parallel wires separated by a distance d carry a current i amp in the same direction. They will