A magnetic needle of magnetic moment 6....

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

6.65 s

8.89 s

6.98 s

8.76 s

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