Physics

Problem

A magnetic needle of magnetic moment

6.7 \times 10^{-2} \text{ Am}^2

and moment of inertia

7.5 \times 10^{-6} \text{ kg m}^2

is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is: a. 6.98 s b. 8.76 s c. 6.65 s d. 8.89 s

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