How does the strength of the magnetic field at the centre ofcircular coil of wire depend on [i] the radiusof the coil, [ii] the number of turns of wire in the coil, and [iii] the strength of current flowing in the coil ?

How does the strength of the magnetic field at the centre ofcircular c

1.	How does the strength of the magnetic field at the centre ofcircular coil of wire depend on [i] the radiusof the coil, [ii] the number of turns of wire in the coil, and [iii] the strength of current flowing in the coil ?
Answer» Solution :i] It is inversely proportional to the radius of the COIL. B `prop` 1/r ii] It is directly proportional to the number of TURNS n of the coil. As the direction of CURRENT in each circular TURN is same, the fieldsdue to the various turns get added up. B `prop` n iii] It is directly proportional to the strength of current passing through the coil B `prop` l