Near the north pole of a bar magnet the average gap between adjacent magnetic field…

PHYSICS · Single correct · CBSE · Physics · Magnetism and Matter · Magnetism and Matter

Problem

Near the north pole of a bar magnet the average gap between adjacent magnetic field lines is about

1\,\text{mm}

, while along the middle of the magnet it is about

4\,\text{mm}

. If the magnetic field close to the pole is

1.2\times10^{-3}\,\text{T}

, the approximate field midway along the magnet is (a)

4.8\times10^{-3}\,\text{T}

(b)

3.0\times10^{-4}\,\text{T}

(c)

9.0\times10^{-4}\,\text{T}

(d)

1.2\times10^{-4}\,\text{T}