Question

Q4. How does the strength of the magnetic field at the centre of a circular coil of wire
depends on (i) the radius of the coil
(ii) the numbers of turns of the coil.
(iii) the strength of the current flowing in the coil.​

Answer 1

Answer:

Magnetic field is inversely proportional to the radius of the coil. (ii) 1 is directly proportional to the number of turns n of the coil. For each circular turn, the direction of current is same. So, the fields due to the various turns get added up.