The AC Generator Quiz
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5 questions, one answer each
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1. What is needed to induce an e.m.f. in a conductor?
- A. A stationary conductor in a steady magnetic field
- B. Relative motion between a conductor and a magnetic field, or a changing field
- C. Any conductor connected to a battery
- D. A conductor at a very high temperature
2. Which of these increases the size of an induced e.m.f.?
- A. Moving the conductor more slowly
- B. Using a weaker magnet
- C. Increasing the number of turns on the coil
- D. Reducing the length of the conductor in the field
3. What components allow a rotating coil in an a.c. generator to stay connected to an external circuit without the wires twisting?
- A. A split-ring commutator
- B. Slip rings and brushes
- C. A relay
- D. A potential divider
4. At what point in its rotation is the e.m.f. of an a.c. generator at a peak?
- A. When the coil is parallel to the magnetic field
- B. When the coil is perpendicular to the magnetic field
- C. When the coil is stationary
- D. The e.m.f. is constant throughout rotation
5. Why does an a.c. generator produce a current that reverses direction periodically?
- A. Because the coil's orientation relative to the field reverses every half-turn as it rotates
- B. Because the wires in the coil are made of alternating materials
- C. Because the slip rings switch polarity randomly
- D. Because the magnetic field itself reverses on its own