A magnetic needle of magnetic moment 6.7 x 10-2 Am2 and moment of inertia 7.5x 10-6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01T. Time taken for 10 complete oscillations is
(a) 8.89s (b) 6.98s (c) 8.76s (d) 6.65s
Correct Option(d) 6.65s
Explanation:
Time ** of oscillation is
Hence, time for 10 oscillations is t=6.65s.
