Electric field strength 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 electric field strength between plates 5.0 mm apart with a p.d. of 400 V?
- A. 8.0 × 10⁴ V m⁻¹
- B. 2.0 × 10⁶ V m⁻¹
- C. 80 V m⁻¹
- D. 1.25 × 10⁻⁵ V m⁻¹
2. A charge of 3.0 × 10⁻⁹ C experiences a force of 1.2 × 10⁻⁵ N in a uniform field. What is the field strength?
- A. 3.6 × 10⁻¹⁴ N C⁻¹
- B. 2.5 × 10⁻⁴ N C⁻¹
- C. 4.0 × 10³ N C⁻¹
- D. 1.2 × 10⁴ N C⁻¹
3. An electron enters a uniform field at right angles to the field lines. Which statement describes its motion?
- A. Straight line at constant speed
- B. Circular path at constant speed
- C. Parabolic path, with constant velocity component along the plates
- D. Parabolic path, with constant speed
4. The distance from a point charge is tripled. By what factor does E change?
- A. 1/3
- B. 1/9
- C. 3
- D. 9
5. Which statement about field lines is correct?
- A. They can cross where the field is strong
- B. They show the force direction on a negative charge
- C. They leave positive charges and enter negative charges
- D. Their spacing has no meaning