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A magnetic needle has a magnetic moment ...

A magnetic needle has a magnetic moment `5.0xx10^(-2)" A "m^(2)` and moment of inertia of `7.8xx10^(-6)"kg m"^(2)` , it performs 12 complete oscillations in 6.0 s. What is the magnitude of magnetic field ?

A

0.012 T

B

0.120 T

C

1.200 T

D

2.10 T

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The correct Answer is:
A
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