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Q.

A thin magnet oscillates with time period T in external magnetic field. If it is cut into four symmetrical parts, the time period of each piece in the same magnetic field will be

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a

T

b

T2

c

T4

d

T22

answer is B.

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Detailed Solution

T=2πIMB  where I=mL212T′=2πI′M′B=2πI16×M4×B=T2 where m=m4,I′=I2
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A thin magnet oscillates with time period T in external magnetic field. If it is cut into four symmetrical parts, the time period of each piece in the same magnetic field will be