D.2 Electric and magnetic fields Quiz
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5 questions, one answer each
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1. The separation of two point charges is halved. The force between them:
- A. halves
- B. doubles
- C. quadruples
- D. stays the same
2. Which charge could not be carried by an oil drop?
- A. 3.2 × 10⁻¹⁹ C
- B. 4.0 × 10⁻¹⁹ C
- C. 4.8 × 10⁻¹⁹ C
- D. 8.0 × 10⁻¹⁹ C
3. Parallel plates 5.0 mm apart have a potential difference of 250 V. The field strength is:
- A. 50 V m⁻¹
- B. 1.25 V m⁻¹
- C. 5.0 × 10⁴ V m⁻¹
- D. 1.25 × 10³ V m⁻¹
4. A glass rod becomes positive when rubbed with silk because:
- A. protons move from silk to glass
- B. electrons move from glass to silk
- C. electrons move from silk to glass
- D. positive charge is created by friction
5. Inside a long current-carrying solenoid the magnetic field lines are:
- A. circles around the axis
- B. parallel and equally spaced
- C. radial from the centre
- D. absent