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Q.

A bar magnet makes 40 oscillations per minute in a vibration magnetometer An identical magnet is demagnetized completely and is placed over the magnet in the magnetometer. The time taken for 40 oscillations by this combination. Ignore induced magnetism.

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a

14.14 minute

b

144.14 minute

c

1.414 minute

d

1.2 minute

answer is C.

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Detailed Solution

f=12πMBI f1=12πMB2I f1f=12 T1T=2 T1=2T
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