B: 180
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The diagram shows a d.c. motor. Why is a split-ring commutator used?
A magnet is pushed slowly into a coil and there is a current in the coil in the direction shown. The magnet is then p…
Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?
A ripple tank is used to show wave behaviour. The dipper vibrates up and down at a constant frequency. What happens t…
A wave has a frequency of 10 kHz. Which pair of values of its speed and wavelength is possible?
Which characteristics describe an image formed by a vertical plane mirror?