C: photocopier
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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?
The electromotive force (e.m.f.) induced in a conductor moving at right-angles to a magnetic field does not depend upon
The diagram shows part of an a.c. generator when its coil is in a horizontal position. The graph shows the voltage ou…
Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms o…