Electromagnets Quiz
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5 questions, one answer each
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1. What is the shape of the magnetic field lines around a straight wire carrying current?
- A. Straight lines along the wire
- B. Concentric circles around the wire
- C. Lines from one end of the wire to the other
- D. No field lines
2. Which change would NOT make an electromagnet stronger?
- A. More current
- B. More turns of wire
- C. A soft iron core
- D. Fewer turns of wire
3. What does the thumb show when the right-hand grip rule is used on a solenoid with fingers following the current?
- A. The north pole
- B. The south pole
- C. The direction of the current in the wire
- D. The size of the field
4. Why is soft iron used in the core of a crane electromagnet?
- A. It is a permanent magnet
- B. It is cheaper than copper
- C. It loses its magnetism when the current is switched off
- D. It conducts electricity to the load
5. Which device uses a small current in an electromagnet to switch a larger current?
- A. A fuse
- B. A relay
- C. A cell
- D. A compass