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A wire B of finite length is kept on the...

A wire B of finite length is kept on the right hand side of a long wire A as shown. Direction of currents on both the wires are shown in figure. Suppose F is the force on wire B and `tau` the torque on it. Then

A

F is upward

B

F is downward

C

`tau` is clockwise

D

`tau` is anticlockwise

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The correct Answer is:
a,c
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