How decreasing the radius of circular coil incresses the strenght of field?
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by decreasing the radius of the coil the no. of turns will be increased as the direction of current will be same through all the turns therefore magnitude of the field adds up and this lead to the increase in the strength of field.
magnetic field is inversely proportional to the radius of the coil
magnetic field is inversely proportional to the radius of the coil
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