Question:medium
A bar magnet of moment of inertia \(9 \times 10^{-5} \text{ kg m}^2\) placed in a vibration magnetometer and oscillating in a uniform magnetic field \(16\pi^2 \times 10^{-5} \text{ T}\) makes 20 oscillations in 15 s. The magnetic moment of the bar magnet is
A bar magnet of moment of inertia \(9 \times 10^{-5} \text{ kg m}^2\) placed in a vibration magnetometer and oscillating in a uniform magnetic field \(16\pi^2 \times 10^{-5} \text{ T}\) makes 20 oscillations in 15 s. The magnetic moment of the bar magnet is
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Always simplify common terms like \(\pi^2\) and powers of 10 before performing long multiplication. It prevents errors and saves significant time in entrance exams.
Updated On: May 6, 2026
- \(3 \text{ Am}^2\)
- \(2 \text{ Am}^2\)
- \(5 \text{ Am}^2\)
- \(6 \text{ Am}^2\)
- \(4 \text{ Am}^2\)
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The Correct Option is A
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