The magnetic induction at a point on the axial line of a short magnet is 10 Tesla east. The magnetic induction at the same point when the magnet is rotated in the anti-clock wise direction by 90° and 180° are:

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10T south and 5T west.

5T south and 10T west.

20T south and 10T west.

10T south and 20T west.

answer is B.

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Detailed Solution

$B_{axial} = \frac{μ_{0}}{4 π} \frac{2 M}{d^{3}} = 10 T When rotated 90^{\circ}, B_{eq} = \frac{B_{axial}}{2} = 5 T south When rotated 180 °, B_{axial} = 10 T direction reverses west.$

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