A series combination of $n_1$ capacitors, each of value $C_1$, is charged by a source of potential difference $4\,V$. When another parallel combination $n_2$ capacitors, each of value $C_2$, is charged by a source of potential difference $V$, it has the same (total) energy store in it, as the first combination has. The value of $C_2$, in terms of $C_1$, is then
$\frac{{2{C_1}}}{{{n_1}{n_2}}}$
$16\frac{{{n_2}}}{{{n_1}}}{C_1}$
$2\frac{{{n_2}}}{{{n_1}}}{C_1}$
$\frac{{16{C_1}}}{{{n_1}{n_2}}}$
If potential at centre of uniformaly charged ring is $V_0$ then electric field at its centre will be (assume radius $=R$)
There is a square gaussian surface placed in $y-z$ plane. Its axis is along $x-$ axis and centre is at origin. Two identical charges, each $Q$, are placed at point $(a, 0, 0)$ and $(-a, 0, 0)$. Each side length of square is $2a$ then electric flux passing through the square is
Three charges $2q,\, - q,\, - q$ are located at the vertices of an equilateral triangle. At the centre of the triangle
Find the equivalent capacitance across $A$ $\&$ $B$ ........$\mu f$
Two parallel metal plates having charges $+ Q$ and $-Q$ face each other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the electric field between the plates will