FRQ — Electrostatics

Case study·Hard exam skill (4/5)·Calculator allowed

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

Two large parallel plates are separated by

4.0\text{ cm}

and maintain a uniform electric field

5.0\times10^3\text{ N C}^{-1}

between them. A proton is released from rest near the positive plate and moves to the negative plate. Take

e=1.6\times10^{-19}\text{ C}

and

m_p=1.67\times10^{-27}\text{ kg}

Total: 5 marks

(a) Find the potential difference between the plates. (1 mark)

(b) Find the kinetic energy gained by the proton. (2 marks)

Your response (optional — you can also work on paper)

Something wrong with this item?