Q.

The magnetic field at a point ‘P’ on the axial line of a short bar magnet is 5μT ,due South. Now the magnet is turned through 900 in anti clockwise direction. Then, the magnetic field at the same point ‘P’ would be

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a

2.5μT   due East

b

2.5μT   due West

c

5μT due North

d

2.5μT due North

answer is B.

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Detailed Solution

After rotation 2.5µT due west equatorial line B↓2 direction = N to S
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The magnetic field at a point ‘P’ on the axial line of a short bar magnet is 5μT ,due South. Now the magnet is turned through 900 in anti clockwise direction. Then, the magnetic field at the same point ‘P’ would be