Assertion (A) : The strength of the magnetic field produced at the centre of a current carrying circ

Question

Assertion (A) : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the number of turns in it.\ Reason (R): The current in each circular turn has the same direction and the magnetic field due to each turn then just adds up.\

Professor PC Thomas Classes · Answer

(a) : The magnitude of the magnetic field at the centre of a current carrying coil depends directly on the\ current flowing through it and total number of turns on the coil. Therefore, if there is a circular coil having $n$ turns, the field produced is $n$ times as large as that produced by a single turn. This is due to the reason that the current in all the circular turns of the coil are in the same direction i.e., the resultant magnetic field due to the coil is equal to the sum of the field due to all these turns.\