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A current $I_1$ carrying wire $A B$ is placed near another long wire $C D$ carrying current $I_2$. If wire $A B$ is free to move, it will have
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rotational as well as translational motion
Since the magnetic field, due to current through wire $C D$ at various locations on wire $A B$ is not uniform, therefore, the wire $A B$, carrying current $I_1$ is subjected to variable magnetic field due to which, neither the force nor the torque on the wire $A B$ will be zero. As a result of which the wire $A B$ will have both translational and rotational motions.
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