Electromagnetism Quiz
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5 questions, one answer each
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1. What is produced around a wire when an electric current flows through it?
- A. A gravitational field
- B. A magnetic field
- C. An electric field only
- D. No field at all
2. Which of these increases the strength of the magnetic field around a wire?
- A. Increasing the distance from the wire
- B. Decreasing the current
- C. Increasing the current
- D. Using a non-conducting wire
3. What does adding an iron core to a solenoid create?
- A. A permanent magnet
- B. An electromagnet
- C. A capacitor
- D. A relay only
4. A wire carries a current of 4 A, has a length of 0.5 m in a magnetic field of flux density 2 T, at right angles to the field. What is the force on the wire?
- A. 1 N
- B. 2 N
- C. 4 N
- D. 8 N
5. In Fleming's left-hand rule, what does the thumb represent?
- A. The current
- B. The magnetic field
- C. The thrust (force)
- D. The voltage