Question

Can Lorentz force density be zero?

Answer 1

Consider a compactly supported current density J in free space which gives rise to a magnetic field B . Can this system's Lorentz force ...

Answer 2

Explanation:

If ϕ is zero, there will be no magnetic force on the particle, which will continue to move undeflected along the field lines. Charged particle accelerators like cyclotrons make use of the fact that particles move in a circular orbit when v and B are at right angles.