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The magnetic needle has magnetic moment ...

The magnetic needle has magnetic moment `3.14 xx 10^(-2) "Am"^(2)` and moment of inertia `1=2 xx 10^(-6)` kg `m^(2)`. It performs 314 complete oscillations in 100 s. What is the magnitude of the magnetic field ?

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`8 xx 10^(-4)` T
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