A rectangular coil of wire can rotate in a magnetic field. The ends of the coil are soldered to the two halves of a split ring. Two carbon brushes are made to press lightly against the split ring and when these are connected in circuit with a battery and rheostat, the coil rotates. This is a description of

A. a suspended- coil vanometer
B. a moving-cell ammeter
C. a d.c generator  
D. an electric motor
E. an induction coil,

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Correct Answer: C