Physics - Magnetism Question with Solution | TestHub

A particle having charge 'q' and mass 'm' is projected with velocity $(4\hat{\mathrm{i}}-6\hat{\mathrm{j}}+3\hat{\mathrm{k}})\mathrm{m}/\sec$ from the origin in a region occupied by electric field ' $E$ ' and magnetic field ' $B$ ' such that $\vec{B}=B_0\hat{j}$ and $\vec{E}=E_0\hat{j}($ take $\frac{q{E}_0}{m}=2)$. Find the time (in sec) when the magnitude of velocity of the charge particle becomes $5\sqrt{5}\mathrm{m}/\sec$. (neglect the gravity)