In a uniform magnetic field of 0.049 T, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is 9.8×10^-6 kg m^2. If the magnitude of magnetic moment of the needle is x×10^-5 Am^2; then the value of 'x' is :

NEET UG 2024 · Physics · Question 3

NEET 2024 Physics, question 3

Question 3 of the NEET 2024 paper (code T2) is a Physics question from Magnetism and Matter. Its idea, Magnet Oscillating in a Field, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 2.

Updated 2026-10-08

Q3 · Physics

9.8\times10^{-6}

The figure, described in words

Magnetic needle suspended in a uniform magnetic field (field lines shown), oscillating about its suspension.

50\pi^2

Official answer: option 2 · NTA final answer key

Same idea

The only question on Magnet Oscillating in a Field

No other NEET paper from 2017–2026 tested this exact idea.

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The chapter

Magnetism and Matter in ten years of NEET

8 questions from 2017–2026, asked in 6 of 10 papers, about 0.8 a paper. Magnetism and Matter alone had 8.

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The only question on Magnet Oscillating in a Field

Magnetism and Matter in ten years of NEET

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