Two parallel large thin metal sheets have equal surface charge densities $(\sigma = 26.4 \times 10^{-12}\,c/m^2)$ of opposite signs. The electric field between these sheets is
$1.5\,N/C$
$1.5\times 10^{-10}\,N/C$
$3\,N/C$
$3\times 10^{-10}\,N/C$
Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric field at $O$ is double the electric field when only one positive charge of same magnitude is placed at $R$. Which of the following arrangements of charges is possible for $P,\,Q,\,R,\,S,\,T,\,$ and $U$ respectively
The unit of intensity of electric field is
A ring of charge with radius $0.5\, m$ having a $0.02\, m$ gap, carries a charge of $+1\, C$. The field at the centre is
A hollow sphere of charge does not produce an electric field at any
Write equation of electric field by system of $\mathrm{'n'}$ charges.