A rectangular coil can rotate in a magnetic field. The two ends of the coil are soldered respectively to the two halves of a commutator. Two carbon brushes are made to press lightly against the commutator and when these are connected in a circuit with a battery and a rheostat, the coil rotates. This is a description of
-
A.
a moving coil ammeter -
B.
a D.C generator -
C.
a D.C electric motor -
D.
An induction coil -
E.
An A.C generator