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Q.

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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a

10T south and 20T west.

b

10T south and 5T west.

c

5T south and 10T west.

d

20T south and 10T west.

answer is B.

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Detailed Solution

Baxial=μ04π2Md3=10 T When rotated 90∘, Beq=Baxial2=5 T south When rotated 180°, Baxial=10 T direction reverses west.

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