A small sphere of radius $r_{1}$ and charge $q_{1}$ is enclosed by a spherical shell of radius $r_{2}$ and charge $q_{2} .$ Show that if $q_{1}$ is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge $q_{2}$ on the shell is.
According to Gauss's law, the electric field between a sphere and a shell is determined by the charge $q_{1}$ on small sphere. Hence, the potential difference, $V$, between the sphere and the shell is independent of charge $q_{2}$. For positive charge $q_{1}$, potential difference $V$ is always positive.
How much positive and negative charge is there in a cup of water $(250\;gm)$?
Why does matter obtain electric charge ?
When ${10^{19}}$ electrons are removed from a neutral metal plate, the electric charge on it is
How can the neutral body be charged electrically ?
Discuss the phenomena experienced due to electrostatics.