JEE Main 2022 · 27 Jul · Shift 1 · Physics Q42

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PhysicsSingle correct+4 / -1Question 42 of 90

Two bar magnets oscillate in a horizontal plane in earth's magnetic field with time periods of 3 s and 4 s respectively. If their moments of inertia are in the ratio of 3:2, then the ratio of their magnetic moments will be:

2:1

8:3

1:3

27:16

Answer and worked solution

Official answer: B

$T=2\pi\sqrt{\frac I{MB}}$ gives $M\propto\frac I{T^2}$ : $\frac{M_1}{M_2}=\frac32\times\frac{16}9=\frac83$ .

(B)

Topics:Magnetic dipole and bar magnet

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JEE Main 2022 · 27 Jul · Shift 1, Physics question 42