Case study·Standard multi-step (3/5)·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
An isolated capacitor of capacitance is charged to and then disconnected. A dielectric slab of constant is inserted fully between its plates.
Total: 5 marks
(a) Find the charge on the capacitor before insertion. (1 mark)
(b) Find the new capacitance and new potential difference. (2 marks)
(c) Find the initial and final stored energies. (2 marks)
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