Q.

The time period of a magnet ( when behaving like a compound pendulum) is T. The bar magnet is cut into 4 equal parts by cutting it normal to its length. The time period of each of them in the same field is

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a

T

b

T/2

c

T/4

d

2T

answer is C.

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Detailed Solution

T=2πIM.B,  SoT1T2=I1I2.M2M1=641.14=41⇒T2=T14
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The time period of a magnet ( when behaving like a compound pendulum) is T. The bar magnet is cut into 4 equal parts by cutting it normal to its length. The time period of each of them in the same field is