Electromagnetic Induction Quiz
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5 questions, one answer each
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1. What is required to induce a voltage in a conductor?
- A. A constant magnetic field around a stationary conductor
- B. A changing magnetic field, or relative motion between conductor and field
- C. Any electric current flowing nearby
- D. A permanent magnet placed next to a battery
2. Which of these increases the size of an induced voltage?
- A. Using a weaker magnet
- B. Moving the conductor more slowly
- C. Using a coil with more turns
- D. Using a thinner wire
3. Why does a generator produce alternating current rather than direct current?
- A. Because the coil is made of copper
- B. Because the rotation continuously reverses the direction of the changing field, reversing the induced voltage
- C. Because generators are connected to batteries
- D. Because direct current cannot be induced
4. A transformer has 400 turns on the primary coil and 100 turns on the secondary coil. If the primary voltage is 200 V, what is the secondary voltage?
- A. 800 V
- B. 50 V
- C. 400 V
- D. 100 V
5. A step-up transformer increases the transmission voltage from 400 V to 40,000 V (a factor of 100) for the National Grid. If the primary current is 100 A, and the transformer is 100% efficient, what is the secondary current?
- A. 100 A
- B. 1 A
- C. 10,000 A
- D. 10 A