A long conducting wire having a current I flowing through it, is … - Vidyadip

MCQ

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 $n$ tums. 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:

A
$N : n$
B
$n^2: N^2$
✓
$N ^2: n ^2$
D
$n: N$

✓

Answer

Correct option: C.

$N ^2: n ^2$

c

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