Earthing of electrical appliances is very important.

How does a current-carrying solenoid behave?

What is the nature of the magnetic field produced by a straight current-carrying conductor? Explain with the help of an experiment.

What happens if a full circular ring is used instead of a split ring (commutator) in an electric generator?

How many times does an $AC$ electric current with the frequency $50\, Hz$ change its direction in one second?

$AB$ is a current-carrying conductor in the plane of the paper as shown in the figure. What are the directions of the magnetic fields produced by it at points $P$ and $Q$? Given $r_1 > r_2$, where will the strength of the magnetic field be larger?