The essential difference between an $AC$ generator and a $DC$ generator is that

Describe in short an activity to:
$(i)$ demonstrate the pattern of magnetic field lines around a straight current-carrying conductor, and
$(ii)$ find the direction of the magnetic field produced for a given direction of current in the conductor. Name and state the rule to find the direction of the magnetic field associated with a current-carrying conductor. Apply this rule to determine the direction of the magnetic field inside and outside a current-carrying circular loop lying horizontally on a table. Assume that the current through the loop is anticlockwise.

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

In which of the following devices is an electric motor $NOT$ used?

Which sources produce alternating current?

The device used for producing electric current is called a