Electricity & Magnetism

Topic overview

Circuits with internal resistance, RC charging and discharging and the time constant, fields and forces, electromagnetic induction, transformers

Key concepts

Round 1/2 cannot be mixed. This site only provides training with limited scope; unverified university-level methods do not enter new problem sets, and no claim is made to be an official complete paper.

Key points

◆Follow the prerequisite knowledge requirements given by the examination body; new concepts may only be used when the question provides sufficient guidance.
◆The examples on this site are training with a limited scope and do not represent full syllabus coverage or official difficulty.

Worked examples

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1Basic examples within scope

A $500\ \mu\mathrm{F}$ capacitor discharges through a $2.0\ \mathrm{k\Omega}$ resistor. How long does it take for the charge to fall to half its initial value?

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