A light circular wire suspended by a thin silk thread in a uniform magnetic fiel

Question

A light circular wire suspended by a thin silk thread in a uniform magnetic field carries a current in the direction shown in the figure below. The magnetic field is perpendicular to the plane of the paper, and the wire is held at rest in that plane. If the wire is suddenly released so that it is free to rotate, It will rotate so that point a goes into the paper. It will rotate clockwise along the vertical axis looking from the top. It will not rotate. It will rotate counterclockwise along the vertical axis looking from the top. It will rotate so that point a goes out of the paper.

Explanation / Answer

From the given data, magnetic field inside the plane of paper. The magnetic field perpendecular to the plane.

The magnetic flux linked with the loop is,

                     Phi=BAcos(90)=0

There is no magnetic flux linked with the loop.

Loop will not rotate.

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