Long answer·Hard exam skill (4/5)·No calculator
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
Four identical positive charges are fixed at the corners of a square of side . Find the magnitude and direction of the net force on the charge at one corner due to the other three charges.
Total: 5 marks
(a) Resolve the forces due to the two adjacent corner charges. (2 marks)
(b) Include the force due to the diagonally opposite charge. (2 marks)
(c) Write the final magnitude and direction. (1 mark)
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