A change q moving along the x- axis with a velocity $\overrightarrow{v}$ is subjected to a uniform magnetic field B acting along the z -axis as it crosses the origin as shown in the figure. (i) Trace the trajectory (ii) Does the change gain kinetic as it enters the magnetic field ?

Question

$\begin{array}{1 1} \text{(i) It is a circle in the X-Y plane (ii) It is a constant } \\ \text{(i) It is a circle in the X-Y plane (ii) It is a increased } \\ \text{(i) It is a circle in the Y-Z plane (ii) It is a constant }\\ \text{(i) It is a circle in the X-Y plane (ii) It is a decreased } \end{array} $