A magnetic needle of magnetic moment 6.7×10−2Am2 and moment of inertia 7.5×10−6kgm2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is
A
6.98 s
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B
8.76 s
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C
6.65 s
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D
8.89 s
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