C: work done / charge
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To charge an isolated metal sphere by induction, the following four processes are required. P The sphere is earthed b…
The potential difference (p.d.) across a 10Ω resistor is 5V. How much charge passes through the 10Ω resistor in 30 se…
Which changes both cause a decrease in the resistance of a copper wire?
Which quantity is measured in kilowatt-hours?
A long flexible wire is wrapped round two wooden pegs. A large current is passed in the direction shown. Which two pa…
The diagram shows a d.c. motor. Why is a split-ring commutator used?