In a uniform magnetic field, the magnetic needle has a magnetic moment 9 . 85 × 10 - 2   A  …

In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85×10-2 A m-2 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 ____mT  [Take π2 as 9.85

Solution

T=2πIMB
B=80×10-4=8 mT

Asked in: JEE Main 2021 (27 Jul Shift 1)

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