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 .........
$\frac{r}{(1+\sqrt{3})}$ from $3 e$ charge
$\frac{r}{(1+\sqrt{3})}$ from $e$ charge
$\frac{r}{(1-\sqrt{3})}$ from $3 e$ charge
$\frac{r}{1+\sqrt{\frac{1}{3}}}$ from $e$ charge
Four point charges $-q, +q, +q$ and $-q$ are placed on $y$ axis at $y = -2d$, $y = -d, y = +d$ and $y = +2d$, respectively. The magnitude of the electric field $E$ at a point on the $x -$ axis at $x = D$, with $D > > d$, will vary as
Two uniform spherical charge regions $S_1$ and $S_2$ having positive and negative charges overlap each other as shown in the figure. Point $O_1$ and $O_2$ are their centres and points $A, B, C$ and $D$ are on the line joining centres $O_1$ and $O_2$. Electric field from $C$ to $D$
Obtain the equation of electric field at a point by system of $\mathrm{'n'}$ point charges.
Two charges $+Q$ and $-2 Q$ are located at points $A$ and $B$ on a horizontal line as shown below.The electric field is zero at a point which is located at a finite distance
Mention characteristics of electric field.