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Q.

As shown in the figure, two very long straight wires are kept parallel to each other and 2A current is passed through then in the same direction. In this condition, the force between them is F. Now if the current in both of them is made 1A and direction are reversed in both, then the force between them ......

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An Intiative by Sri Chaitanya

a

Will be F4 and attraction

b

Will be F2 and repulsive

c

Will be F2 and attractive

d

Will be F4 and repulsive

answer is A.

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Detailed Solution

According to equation F=μ0I1I2l2πy current is halved then force becomes F/4 and flowing in same direction so there is attractive force between them.

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