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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?
A rod of metal is heated at one end. Which statement best describes the conduction of heat through the metal?
Many gas appliances such as ovens and heaters use a small flame to ignite the main burner. To make sure that the smal…
A hot liquid is allowed to cool. The graph shows the cooling curve. In which part of the curve is latent heat released?