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  4. A current I1 carrying wire AB is placed near another long wire CD carrying current I2. If wire AB is free to move, it will have

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Q. A current $I_1$ carrying wire $AB$ is placed near another long wire $CD$ carrying current $I_2$. If wire $AB$ is free to move, it will havePhysics Question Image

AIIMSAIIMS 2009Moving Charges and Magnetism

Solution:

Since the magnetic field, due to current through wire $CD$ at various locations on wire $AB$ is not uniform, therefore, the wire $AB$, carrying current I1 is subjected to variable magnetic field due to which, neither the force nor the torque on the wire $AB$ will be zero. As a result of which the wire $AB$ will have both translational and rotational motions.

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