Write the expression, in a vector form, for the Lorentz magnetic force `vecF` due to a charge moving with velocity `vecV`B→" role="presentation" style="position: relative;"> B→ in a magnetic field `vecB`. What is the direction of the magnetic force?
Write the expression for the force `vecF` acting on a particle of mass m and charge q moving with velocity `vecV` in a magnetic field `vecB` , Under what conditions will it move in (i) a circular path and (ii) a helical path?
Show that the kinetic energy of the particle moving in a magnetic field remains constant.
A neutron, an electron and an alpha particle, moving with equal velocities, enter a uniform magnetic field going into the plane of the paper, as shown. Trace their paths in the field and justify your answer.
