In Fig. the magnetic needle has magnetic moment 6.7×10–2 Am2 and moment of inertia I = 7.5×10–6 kg m2. It performs 10 complete oscillations in 6.70 s. What is the magnitude of the magnetic field ?

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answer is 4.

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Detailed Solution

n=12πMBI 106.7=12π6.7 x 10-2 B7.5 x 10-6, B=0.01 T

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