Lorentz Force — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Lorentz Force Applicable to any point charge moving in the presence of both electric and magnetic fields. The force is a vector sum of Electric Force and Magnetic Force. Electric Force: F e = qE (Independent of motion). Magnetic Force: F m = q(v × B) (Dependent on velocity and angle). Combine to get F = F e + F m. Applies to point charges. The velocity v must be measured in the same inertial frame as E and B. For the magnetic component F = qvB, v must be perpendicular to B for the simple scalar product; otherwise, the cross product applies. Thinking magnetic force does work (it does zero work as force is perpendicular to velocity). Confusing the direction given by Right Hand Rule for negative charges (direction is opposite). Assuming force exists on a stationary charge in a magnetic field (v=0 implies F m=0).