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A magnetic needle of magnetic moment 6.7...

A magnetic needle of magnetic moment `6.7xx10^(-2)Am^(2)` and moment of inertia `7.5xx10^(-6)kg" "m^(2)` is performing simple harmonic oscillations in a magnetic field of 0.01 T. time taken for 10 complete oscillations is:-

A

6.65s

B

8.89s

C

6.98s

D

8.76s

Text Solution

Verified by Experts

The correct Answer is:
A
`T=2pisqrt(I/(MB))=(2pi)/10xxx1.05S`, For 10 oscillation `t=10T=2pixx1.05~~6.65S`
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