An alternating electric current has a frequency of $50 \ Hz$. How many times does it change its direction in one second (in $times$)?

$A$ circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is $ON$. The current as seen from points $A$ and $B$ (in the plane of paper and on the axis of the coil) is anti-clockwise and clockwise respectively. The magnetic field lines point from $B$ to $A$. The $N-$ pole of the resultant magnet is on the face close to

An electron enters a uniform magnetic field at right angles to it as shown in the figure below. In which direction will this electron move? State the rule applied by you in finding the direction of motion of the electron.

On which principle does an electric generator work?

Which scientist discovered that an electric current can be produced using a magnetic field?

The induced electromotive force $(EMF)$ in a conducting coil does not depend on which of the following?