Electric potential Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. What is the potential 0.50 m from a point charge of +5.0 nC in a vacuum?
- A. 1.8 × 10² V
- B. 2.5 × 10⁻⁹ V
- C. 90 V
- D. 45 V
2. How much work is done moving a charge of 3.0 µC through a potential difference of 200 V?
- A. 6.7 × 10⁷ J
- B. 1.5 × 10⁻⁸ J
- C. 0 J
- D. 6.0 × 10⁻⁴ J
3. Which statement about equipotential surfaces is correct?
- A. Field lines are parallel to them
- B. No work is done moving a charge along them
- C. They are closest where the field is weakest
- D. They always have zero potential
4. The V–r graph for a point charge has a gradient of −400 V m⁻¹ at a point. What is E there?
- A. −400 V m⁻¹
- B. 400 V m⁻¹ directed away from the charge, if Q is positive
- C. 400 V m⁻¹ directed towards a positive charge
- D. 0.0025 V m⁻¹
5. What does the area under an E–r graph between r₁ and r₂ represent?
- A. The charge on the source
- B. The potential difference between r₁ and r₂
- C. The force on a unit charge
- D. The work done per unit mass