a. When a coil rotates in a magnetic field, an alternating voltage is produced. Explain how the voltage is produced.

b. The diagrams A B and C show three positions of a coil as it rotates clockwise in a magnetic field produced by two poles. The graph below shows how the voltage produced changes as the coil rotates.

When the coil is in the position shown by diagram A, the output voltage is zero and is marked as 1 on the voltage—time graph. State which point on the voltage—time graph corresponds to the coil position shown by

i. Diagram B,

ii. Diagram C.

c. State one way of increasing the size of the voltage produced by this coil rotating in a magnetic field.

Transcribed Image Text:

N B