Magnetic Fields

Question 1

Explain why the path of an electron in a magnetic field is in the path of an arc of a circle.

Answer 1

In the magnetic field, the force acting on the electron is normal to the direction of motion of the electron.

The magnetic field exerts a constant force of the electron, so the kinetic energy/ speed of the electron is constant.

This magnetic force provides the centripetal force.

Question 2

Define magnetic flux.

Answer 2

It is the product of flux density and area.

The direction of flux is normal to the area.