Q1. Two circular coils in same plane have common center point, diameter of the 1st coil is three times of the 2nd coil and both of them are carrying the same current intensity in the same direction. When direction of current for the 1st coil is reversed, magnetic flux density at center is decreased to third of its value. (By giving that: B1 of the 1st coil < B2 of the 2nd coil). So The ratio between their number of turns N1 : N2 is: *
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