A charged particle of mass m and charge q is projected with velocity v→  into a uniform magnetic field B→ . The force experienced by the particle is:

Force on a change q moving in a magnetic field is known as Lorentz force given as F=qvBsinθ     …(i)Where θ  is the angle between v→  and B→ . Velocity we write eq. (i) asF→=q(v→×B→)