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

F is upward

F is downward

`tau` is clockwise

`tau` is anticlockwise

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The correct Answer is:

a,c

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