In a hollow spherical shell, potential $(V)$ changes with respect to distance $(s)$ from centre as
Two point charges $+q$ and $-q$ are held fixed at $(-d, 0)$ and $(d, 0)$ respectively of a $x -y$ coordinate system. Then
A parallel plate capacitor has circular plates of $10\, cm$ radius separated by an air-gap of $1\, mm$ . It is charged by connecting the plates to a $100\, volt$ battery. Then the change in energy stored in the capacitor when the plates are moved to a distance of $1\, cm$ and the plates are maintained in connection with the battery, is
Two spheres of radius $a$ and $b$ respectively are charged and joined by a wire. The ratio of electric field of the spheres is
Electrostatic field of a long uniformly charged wire varies with distance $(r)$ according to relation
What is the effective capacitance between points $X$ and $Y$ ?......$\mu F$