Magnetic Effects Of Current Question 19
Question 19 - 31 January - Shift 2
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:
(1) $N: n$
(2) $n^{2}: N^{2}$
(3) $N^{2}: n^{2}$
(4) $n: N$
