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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A moving coil galvanometer has a coil of area A and number of turns N. A magnetic field B is applied on it. The torque acting on it is given by t = ki where i is current through the coil. If moment of inertia of the coil is l about the axis of rotation

A moving coil galvanometer has a coil of area A and number of turns N. A magnetic field B is applied on it. The torque acting on it is given by t = ki where i is current through the coil. If moment of inertia of the coil is l about the axis of rotation

A rectangular loop PQRS made from a uniform wire has length a which remains hinged along a horizontal line taken as the y-axis (see figure). Take the vertically upward direction as the z-axis. A uniform magnetic field B = (3iˆ+4kˆ)B0 exists in the region. width b and mass m. It is free to rotate about the arm PQ