Question

Mention the expression for Lorentz’s force. 

Answer 1

In the presence of both electric field, E(r) and magnetic field, B(r) a point charge ‘q’ is moving with a velocity v. Then the total force on that charge is Lorentz force, 

i.e F = F_electric + F_magnetic = qE(r) + qvB(r) 

Note: 1. Magnetic force on the charge depends on ‘q’, ‘v’ and ‘B’ 

2.  and is always perpendicular to the plane containing v and B. Also, F = qvBsinθ n^{^}

3. If θ = 0 or 180° , then F = 0 and if θ = 90º, then F = F_maximum = qvB.