# A magnetic needle of magnetic moment 6.7×10−2 Am2 and moment of inertia 7.5×10−6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T.  Time taken for 10 complete oscillations is : Option 1)  6.65 s   Option 2) 8.89 s   Option 3)  6.98 s   Option 4)  8.76 s

As we learnt in

Time period of Oscillating Bar Magnet -

- wherein

I = Moment of Inertia of short bar magnet

M - Mass of bar magnet

Hence T = 6.65 s

Option 1)

6.65 s

Correct

Option 2)

8.89 s

Incorrect

Option 3)

6.98 s

Incorrect

Option 4)

8.76 s

Incorrect

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