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A coil al a moving Coil galvanometer twi...

A coil al a moving Coil galvanometer twists through `90^@` when a current of one microampere is passed through it. If the area of the coil is `10^-4 m^2` and it has `100` turns, calculate the magnetic field of the magnet of the galvanometer. Given, `k = 10^-8N -m /degree.`

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