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The metal case of an electric heater is earthed. The plug to the heater contains a 5 A fuse. There is a current of 4 …
A cathode-ray oscilloscope is connected to an a.c. generator. A wave is seen on the screen of the oscilloscope. The s…
A capacitor C charges when it is connected to a d.c. power supply. Which arrows show the direction of the conventiona…
Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?
The diagram shows three pairs of parallel wires with the currents in the directions shown. For each pair of wires, wh…
The coil in an electric motor is wound onto a cylinder. Why is the cylinder made of soft iron?