A charged particle moves in magnetic field $\overrightarrow{B}=10\widehat{i}$ with initial velocity  $\overrightarrow{u}=5\widehat{i}+4\widehat{j}$. The path of the particle will be

Y-component of velocity will make the particle to move in circle whereas X-component of velocity will make particle move along X-axis. So, motion is helical.