Moving charges in a magnetic field 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. A proton moves at 3.0 × 10⁶ m s⁻¹ perpendicular to a field of 0.50 T. What is the force on it?
- A. 2.4 × 10⁻¹³ N
- B. 4.8 × 10⁻²⁶ N
- C. 2.4 × 10⁻²⁵ N
- D. 1.5 × 10⁻¹³ N
2. A positive and a negative particle enter the same field with the same velocity. How do their deflections compare?
- A. Same direction
- B. Opposite directions
- C. Neither is deflected
- D. Only the positive is deflected
3. What happens to the radius of a particle's path if its speed is tripled in a fixed field?
- A. It triples
- B. It becomes one third
- C. It is unchanged
- D. It becomes nine times larger
4. Why does the time for a semicircle in a cyclotron stay constant as the particles speed up?
- A. Mass decreases
- B. Charge increases
- C. The field strengthens
- D. The radius grows in proportion to the speed
5. An alpha particle (charge 2e) and a proton have the same momentum in the same field. What is the ratio of radius of alpha to proton?
- A. 2
- B. 1/2
- C. 1
- D. 4