You can get a uniform electric field between two oppositely charged parallel plates. Can you recall and write down the definition for electric field strength E?

Figure, shows how radiation from a radioactive material passes through a region of uniform magnetic field. State and explain whether each type of radiation has positive or negative charge, or is uncharged.

Three types of radiation passing through a magnetic field.

An electron is moving at $1.0\times {10}^6 m{s}^{-1}$ in a uniform magnetic field of flux density $0.50 T.$ Calculate the force on the electron when it is moving:

(a) at right angles to the field

An electron is moving at$1.0\times {10}^{6}m{s}^{-1}$ in a uniform magnetic field of flux density $0.50T.$. Calculate the force on the electron when it is moving:

(b at an angle of $45°$ to the field.

Look at the photograph of the electron beam in the fine-beam tube.

State the direction is the magnetic field (into or out of the plane of the photograph).

In this fine-beam tube, a beam of electrons is bent around into a circular orbit by a uniform magnetic field. The beam is shown up by the presence of a small amount of gas in the tube.

The particles in the circular beam shown in Figure all travel round in the same orbit. State what can you deduce about their mass, charge and speed.

In this fine-beam tube, a beam of electrons is bent around into a circular orbit by a uniform magnetic field. The beam is shown up by the presence of a small amount of gas in the tube.

An electron beam in a vacuum tube is directed at right angles to a magnetic field, so that it travels along a circular path. Predict the effect on the size and shape of the path that would be produced (separately) by each of the following changes:

(a) increasing the magnetic flux density.

An electron beam in a vacuum tube is directed at right angles to a magnetic field, so that it travels along a circular path. Predict the effect on the size and shape of the path that would be produced (separately) by each of the following changes:

(b) reversing the direction of the magnetic field.