Physics - Electrostatics Question with Solution | TestHub

A particle having a mass of $10^{-2}\mathrm{kg}$ carries a charge of $5\times 10^{-8}\mathrm{C}$. The particle is given an initial horizontal velocity of $10^5{\mathrm{ms}}^{-1}$ in the presence of electric field $\vec{E}$ and magnetic field $\vec{B}$. To keep the particle moving in a horizontal direction, it is necessary that (1) $\vec{B}$ should be perpendicular to the direction of velocity and $\vec{E}$ should be along the direction of velocity. (2) Both $\vec{B}$ and $\vec{E}$ should be along the direction of velocity. (3) Both $\vec{B}$ and $\vec{E}$ are mutually perpendicular and perpendicular to the direction of velocity. (4) $\vec{B}$ should be along the direction of velocity and $\vec{E}$ should be perpendicular to the direction of velocity. Which one of the following pairs of statements is possible?NEET 2010 (Mains)