In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 × 10⁻² A/m² and moment of inertia 5 × 10⁻⁶ kg m². If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _ _ _ _ _ _ _ m T. [Take π ² as 9.85]

Magnetic Effects of Current and Magnetism: JEE Main 2021 Physics question

JEE Main 2021 · 27 Jul, Morning shift · Q65

JEE Main 202127 Jul, Morning shiftPhysicsMediumMagnetic Effects of Current and Magnetism165× since 2002

In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85

\times

10^

-

2 A/m² and moment of inertia 5

\times

10^

-

6 kg m². If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is _______________ mT. [Take

\pi

² as 9.85]

Your answerType your answer. Integers and decimals are accepted.

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