A metallic rod is placed in a uniform electric field. Select the correct option.
Inside the rod there will be an induced electric field from $B$ to $A.$
Free electrons will accumulate at the end $B$ of the rod.
The potential of the end $A$ will be more than that at $B.$
The electric field outside the rod will not change due to the induced charged in the rod.
Two concentric hollow conducting spheres of radius $r$ and $R$ are shown. The charge on outer shell is $Q$. What charge should be given to inner sphere so that the potential at any point $P$ outside the outer sphere is zero?
A point charge $q$ is placed in a cavity in a metal block. If a charge $Q$ is brought outside the metal, then the electric force experienced by $q$ is
An empty thick conducting shell of inner radius $a$ and outer radius $b$ is shown in figure.If it is observed that the inner face of the shell carries a uniform charge density $-\sigma$ and the surface carries a uniform charge density $ '\sigma '$
If a point charge $q_A$ is placed at the center of the shell, then choose the correct statement $(s)$
A conducting sphere $A$ of radius $a$, with charge $Q$, is placed concentrically inside a conducting shell $B$ of radius $b$. $B$ is earthed. $C$ is the common centre of the $A$ and $B$.
If $q$ is the charge per unit area on the surface of a conductor, then the electric field intensity at a point on the surface is