The magnetic field due to a short bar magnet at an axial point at a distance 'r' from its centre is 'B'. If…
The magnetic field due to a short bar magnet at an axial point at a distance 'r' from its centre is 'B'. If this axis is moved towards the equator of the magnet along a circular path of radius 'r' then the magnetic field 'B' will
not Change.
go on increasing.
increase from zero to infinity.
go on decreasing.
Solution
Magnetic field due to a bar magnet on the axial point:
- Magnetic field due to a bar magnet on the axial point at a distance $r$ from the centre of magnet is given as,
$\Rightarrow B=\frac{\mu_o}{4 \pi} \frac{2 M r}{\left(r^2-l^2\right)^2}$
If $r \gg$ |
$\Rightarrow B=\frac{\mu_o}{4 \pi} \frac{2 M}{r^3}$