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A current carrying wire $PQ$ is placed $ \perp$ to another wire $RS$ carrying a constant current. If the second wire is free to move, it will have


$\begin {array} {1 1} (a)\;Translational\: motion\: only & \quad (b)\;Rotational\: motion \: only \\ (c)\;No\: motion\: at\: all & \quad (d)\;Both\: translational\: and\: rotational \: motion \end {array}$


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The field due to $RS$ is different at $P$ and $Q$ hence there is both a force and a torque.
$ \therefore PQ$ will have both the type of motions
Ans : (d)
answered Feb 23, 2014 by thanvigandhi_1

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