The magnetic flux density at a two points on the axis of circular coil of wire carrying an electric current are in ratio of 8:1 and a distance of 5 cm and 20 cm from the centre of coil. Find the diameter of the coil?
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The direction of the magnetic intensity at P is along OP if the current flows through the coil in the anti-clock-wise direction as seen from P. If the direction of the current is clockwise the field at P is along PO. If we move away from O towards the right or left, the intensity of the magnetic field decreases
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