A wire is placed at right angles to a uniform magnetic field. There is a current in the wire and it experiences a force. Beams of alpha-particles, beta-particles and neutrons are fired into the magnetic field in the same direction as the conventional current in the wire. Which beams experience a force that is initially in the same direction as the force experienced by the current-carrying wire?

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 magnet is pushed slowly into a coil and there is a current in the coil in the direction shown. The magnet is then p…

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?

For the same temperature rise and the same original volume, which of the three states of matter expands the most and …