Question

What is the maximum force on an aluminium particle with a +0.1 𝜇𝐶 of charge, which is passing between the poles of a 1.5 𝑇 permanent magnet at a speed of 5 𝑚𝑠−1? In what direction is the force?

Hint: Assume the direction of the magnetic field as preferred. Draw a diagram showing all the relevant vectors in terms of their components. Use the equation for the force on a moving charged particle in a magnetic field.

Answer 1

$F_{max}=qvB=0.75~\mu N.$