Electric potential and field patterns Quiz
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5 questions, one answer each
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1. Two parallel plates 25 mm apart have a potential difference of 500 V. What is the field strength between them?
- A. 2.0 × 10⁴ V m⁻¹
- B. 1.25 × 10⁴ V m⁻¹
- C. 20 V m⁻¹
- D. 5.0 × 10⁻⁵ V m⁻¹
2. The distance from a point charge is doubled. What happens to the potential?
- A. It is divided by 4
- B. It is multiplied by 2
- C. It is divided by 2
- D. It is unchanged
3. Which statement about field lines and equipotentials is correct?
- A. They are parallel to each other
- B. They meet at right angles
- C. They never meet
- D. They meet at 45°
4. Which of these describes the equipotentials around an isolated positive point charge?
- A. Parallel planes
- B. Radial lines
- C. Concentric spheres
- D. Straight lines parallel to the field
5. A point between equal and opposite charges is at 0 V. What can be concluded about the field there?
- A. It is zero
- B. It cannot be found without knowing the potential elsewhere
- C. It is directed towards the positive charge
- D. It can be non-zero, because the field depends on the potential gradient