Write the Gauss’s law in equation form for electrostatics and magnetism. What is the difference between them ?
Gauss's law for electrostatic,
$\sum \overrightarrow{\mathrm{E}} \cdot \overrightarrow{\Delta \mathrm{S}}=\frac{q}{\varepsilon_{0}}$
(Where charge $q$ enclosed by a surface)
Gauss's law for magnetism,
$\sum \overrightarrow{\mathrm{B}} \cdot \overrightarrow{\Delta \mathrm{S}}=0$
The difference between the Gauss's law of magnetism and electrostatics is that isolated magnetic poles (also called monopoles) does not exist.
A bar magnet of length $6\,cm$ has a magnetic moment of $4\,J\,T^{-1}$. Find the strength of magnetic field at a distance of $200\,cm$ from the centre of the magnet along its equatorial line.
A short bar magnet with its north pole facing north forms a neutral point at $P$ in the horizontal plane. If the magnet is rotated by $90^o$ in the horizontal plane, the net magnetic induction at $P$ is (Horizontal component of earth’s magnetic field = ${B_H}$)
Two magnets, each of magnetic moment $‘M’ $ are placed so as to form a cross at right angles to each other. The magnetic moment of the system will be
In which direction does a free hanging magnet get stabilized ? Explain.
The dipole moment of a short bar magnet is $1.25\, A-m^2$. The magnetic field on its axis at a distance of $0.5$ metre from the centre of the magnet is