D: 480 C
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A capacitor C charges when it is connected to a d.c. power supply. Which arrows show the direction of the conventiona…
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…
The coil in an electric motor is wound onto a cylinder. Why is the cylinder made of soft iron?
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…