Moving Charges And MagnetismClass 12 Physics MCQs

Who first demonstrated the connection between electricity and magnetism by observing the deflection of a compass needle near a current-carrying wire in 1820?

A charged particle with charge q moves with velocity \mathbf{v} in a region with both electric field \mathbf{E} and magnetic field \mathbf{B}. What is the expression for the total force, known as the Lorentz force, acting on the particle?

A proton is moving in a uniform magnetic field. Which of the following statements about the work done by the magnetic field and the kinetic energy of the proton is correct?