A tangent galvanometer has a coil of 2 turn of mean radius 7.5cm, which is set with its plane in the magnetic meridian. A current is passed through the coil and produces a deflection of a magnet, pivoted at the center of the coil, of 450. Calculate the current if the horizontal component of the earth’s flux density is 1.8×10^−5Wbm^−2
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