Which of the following is a volt :
$Erg$ per $cm$
$Joule$ per $coulomb$
$Erg $ per $ampere$
$Newton / (coulomb \times m^2)$
The plates of a parallel plate capacitor are charged up to $100\, volt$. A $2\, mm$ thick plate is inserted between the plates, then to maintain the same potential difference, the distance between the capacitor plates is increased by $1.6\, mm$. The dielectric constant of the plate is
The force on a charge situated on the axis of a dipole is $F$. If the charge is shifted to double the distance, the new force will be
Angle between equipotential surface and lines of force is.......$^o$
The electric potential $V$ at any point $(x,y,z)$ in space is given by equation $V = 4x^2\,volt$ where $x, y$ and $z$ are all in metre. The electric field at the point $(1\,m, 0, 2\,m)$ in $V/m$ is
If on the concentric hollow spheres of radii $r$ and $R( > r)$ the charge $Q$ is distributed such that their surface densities are same then the potential at their common centre is