A magnetic needle of magnetic moment 6 .7 × 10 - 2 A m 2 and moment of inertia 7 .5 × 10 - 6 kg m 2 is performing simple harmonic oscillations in a magnetic field of 0 . 01 T . Time taken for 10 complete oscillations is:

Question

A magnetic needle of magnetic moment 6 .7 × 10 - 2 A m 2 and moment of inertia 7 .5 × 10 - 6 kg m 2 is performing simple harmonic oscillations in a magnetic field of 0 . 01 T . Time taken for 10 complete oscillations is:, 8 . 76 s, 6 . 65 s, 8 . 89 s, 6 . 98 s

MARKS App · Accepted Answer

Time period of oscillating magnetic needle is T = 2 π I M B = 2 π 7.5 × 10 - 6 6.7 × 10 - 2 × 0.01 sec = 0.6647 sec Time for oscillations, t = 10 T = 6.647 sec ⁡ = 6.65 sec

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