A charged particle (charge q, mass m) is placed at the centre of a circular region containing a magnetic field. The field is given as $\overrightarrow{B}=\overrightarrow{B}\left(r\right)$ i.e; it is a function of radial distance and it is perpendicular to the plane of the circle. The total magnetic flux through the circle is zero. The particle is given a radial impulse. At a later instant the radial and tangential components of velocity of the particle are $v_{r}and{v}_{\theta }$ respectively.