The Motor Effect Quiz
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5 questions, one answer each
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1. What is the motor effect?
- A. A magnet becoming demagnetised over time
- B. A current-carrying conductor in a magnetic field experiencing a force
- C. A pd being induced by a moving magnet
- D. Two magnets attracting each other
2. When does a current-carrying conductor experience no force in a magnetic field?
- A. When the current is very large
- B. When the conductor is parallel to the field
- C. When the conductor is at right angles to the field
- D. When the field is very strong
3. In Fleming's left-hand rule, what does the thumb represent?
- A. Current
- B. Magnetic field
- C. Force (motion)
- D. Voltage
4. Which change would increase the force on a current-carrying wire in a magnetic field?
- A. Decreasing the current
- B. Using a weaker magnet
- C. Increasing the length of wire in the field
- D. Making the wire parallel to the field
5. A coil carrying a current is placed in a magnetic field and begins to rotate. Why does this rotation happen?
- A. Because the coil heats up and expands
- B. Because the current in each side of the coil flows in opposite directions, so the forces on each side act in opposite directions, creating a turning effect
- C. Because the magnetic field induces a pd across the coil
- D. Because the coil loses its magnetism