A current loop is in a uniform magnetic field. Which describes the rotation of t

Question

A current loop is in a uniform magnetic field. Which describes the rotation of the loop? a) The loop tends to rotate so that the direction of the normal vector is in the same direction of the magnetic field vector. b) The loop tends to rotate so that the direction of the normal vector is perpendicular to the direction of the magnetic field vector. c) The loop tends to rotate so that the current is parallel to the direction of the magnetic field vector. d) The loop tends to rotate so that the net force vector on the loop is maximized.

Explanation / Answer

In uniform magnetic field torque is given by:

tau = i*AxB

So loop will rotate until the torque is maximized

tau = i*AxB

AXB = A*B*sin theta

when theta = 90 deg, torque will be max, So

loop will rotate so that direction of normal vector is perpendicular to the direction of magnetic field.

Correct option is B,

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