Page 63 - Teach Yourself Electricity and Electronics

Quiz 43

C. The gauss.
D. The gauss-turn.
19. A ferromagnetic material:
A. Concentrates magnetic flux lines within itself.
B. Increases the total magnetomotive force around a current-carrying wire.
C. Causes an increase in the current in a wire.
D. Increases the number of ampere-turns in a wire.

20. A coil has 500 turns and carries 75 mA of current. The magnetomotive force
will be:
A. 37,500 At.
B. 375 At.
C. 37.5 At.
D. 3.75 At.