C: iron
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Which properties make materials suitable for use as a core in an electromagnet?
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?
Using an electric kettle, 200 g of water at 100 °C is converted into steam at 100 °C in 300 seconds. The specific lat…
When a gas in a container of fixed volume is heated, the pressure of the gas increases. Which statement explains this?
A ripple tank is used to show wave behaviour. The dipper vibrates up and down at a constant frequency. What happens t…