Tardigrade
Question
Physics
A long conducting wire having a current I flowing through it, is bent into a circular coil of N turns. Then it is bent into a circular coil of n turns. The magnetic field is calculated at the centre of coils in both the cases. The ratio of the magnetic field in first case to that of second case is :

Q. A long conducting wire having a current I flowing through it, is bent into a circular coil of $N$ turns. Then it is bent into a circular coil of $n$ turns. The magnetic field is calculated at the centre of coils in both the cases. The ratio of the magnetic field in first case to that of second case is :

742 120 JEE MainJEE Main 2023Moving Charges and Magnetism Report Error

A

$n : N$

B

$N : n$

C

$N^{2} : n^{2}$

D

$n^{2} : N^{2}$

Solution:

Correct answer is (c) $N^{2} : n^{2}$