Which device uses direct current $(DC)$?

Which of the following appliances does not have a lower power rating?

$A$ beam of alpha particles enters a chamber moving along a magnetic field. What is the magnetic force experienced by the beam?

Explain briefly different methods of producing induced electromotive force $(emf)$.

On which principle does an electric generator work?

Explain the meanings of the words "electromagnetic" and "induction" in the term electromagnetic induction. List three factors on which the value of induced current produced in a circuit depends. Name and state the rule used to determine the direction of induced current. State one practical application of this phenomenon in everyday life.