C: magnetic field
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A wire hangs between the poles of a magnet. When there is a current in the wire, in which direction does the wire move?
The diagram shows a simple d.c. motor. Which labelled part is the commutator?
Two leads emerging from a box are connected to a sensitive ammeter. When a bar magnet moves towards the open end of t…
Two identical metal plates are painted, one matt (dull) white and the other matt black. These are placed at equal dis…
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?