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A moving-coil galvanometer has 100 turns and each turn has an area 2.0 cm. The magnetic field produced by the magnet is 0.01 T.

A moving-coil galvanometer has 100 turns and each turn has an area 2.0 cm. The magnetic field produced by the magnet is 0.01 T. The deflection in the coil is 0.05 radian when a current of 10 mA is passed through it. Find the torsional constant of the suspension wire.

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