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JEE Main202127 Jul 2021Morning ShiftPhysicsMagnetic Properties of MatterActual

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 m 2 . If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is ____ mT [Take π 2 as 9 . 85

Correct answer

0

Step-by-step solution

T = 2 π I M B B = 80 × 10 - 4 = 8   mT

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