Question

The magnetic field around a current carrying conductor is (a) directly proportional to r
(b) inversely proportional to r (c) directly proportional to r2 (d) inversely proportional to r2

Answer 1

(d).

The magnetic field around a current carrying conductor is inversely proportional to the square of 'r'.

Answer 2

The magnetic field around a current carrying conductor is inversely proportional to the r.

Explanation:

The magnetic field around a current carrying conductor is given by the following formula as :

$B=\dfrac{\mu_o I}{2\pi r}$

Where

$\mu_o$ is permeability of free space

I is the current

r is the distance from the wire

It is clear that the magnetic field around a current carrying conductor is inversely proportional to the r. Hence, the correct option is (b).

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