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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 13 - Magnetic Effect of Current > A magnetic needle of magnetic moment 6.7 x 10^-2 Am^2 and moment of inertia 7.5 x 10^-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 magnetic needle of magnetic moment 6.7 x 10^-2 Am^2 and moment of inertia 7.5 x 10^-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 circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field Bi . The torque on the coil due to the magnetic field is