Charges $Q _{1}$ and $Q _{2}$ arc at points $A$ and $B$ of a right angle triangle $OAB$ (see figure). The resultant electric field at point $O$ is perpendicular to the hypotenuse, then $Q _{1} / Q _{2}$ is proportional to
$\frac{ x _{2}^{2}}{ x _{1}^{2}}$
$\frac{x_{1}^{3}}{x_{2}^{3}}$
$\frac{x_{1}}{x_{2}}$
$\frac{ x _{2}}{ x _{1}}$
Electric field at centre $O$ of semicircle of radius $a$ having linear charge density $\lambda$ given is given by
Two point charge $-q$ and $+q/2$ are situated at the origin and at the point $(a, 0, 0)$ respectively. The point along the $X$ - axis where the electric field vanishes is
Mention characteristics of electric field.
A charged particle of mass $5 \times {10^{ - 5}}\,kg$ is held stationary in space by placing it in an electric field of strength ${10^7}\,N{C^{ - 1}}$ directed vertically downwards. The charge on the particle is
Two charges $e$ and $3 e$ are placed at a distance $r$. The distance of the point where the electric field intensity will be zero is .........