A particle having a mass of $10^{-2} \mathrm{~kg}$ carries a charge of $5 imes 10^{-8} \mathrm{C}$

Question

A particle having a mass of $10^{-2} \mathrm{~kg}$ carries a charge of $5 	imes 10^{-8} \mathrm{C}$. The particle is given an initial horizontal velocity of $10^{5} \mathrm{~m} \mathrm{~s}^{-1}$ 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?\

Professor PC Thomas Classes · Answer

(c)\