Edexcel IGCSE Physics 6 11p Charged Particles in Magnetic Fields Questions

A charged particle moving through a magnetic field experiences a force when its motion is not parallel to the field. Because the force is perpendicular to velocity, it can bend the path without changing speed.

Exam points

Use magnetic-field and velocity directions to find the force direction on a positive particle, or infer its motion from the force; apply this to curved-path diagrams.
Explain that magnetic force acts at right angles to velocity, changing the particle’s direction and bending its path while its speed can remain constant.

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The diagram shows a machine that can be used to measure the speed of fast-moving protons.

Figure for Question Edexcel IGCSE Physics 6 11p Charged Particles in Magnetic Fields Questions question 1 — Edexcel IGCSE Physics

The proton passes through a hole in the negatively charged plate and enters an area where there is a magnetic field.

The magnetic field exerts a force on the proton, as shown in the diagram.
This force causes the proton to follow a circular path without changing speed.

Give the direction of the magnetic field.

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Edexcel IGCSE Physics 6 11p Charged Particles in Magnetic Fields Questions question 1