A large flat metal surface has a uniform charge density `+sigma`. An electron of mass `m` and charge `u` and returns to it at point `B`. Disregard gravity . The maximum value of `AB` is

A large flat metal surface has a uniform charge density ( +sigma ). An electron of mass m and charge rho leaves the surface at the point A with speed u and returns to it at point B. Disregarding gravity the maximum value of AB is

A large flat metal surface has a uniform charge density ( +sigma ). An electron of mass m and charge rho leaves the surface at the point A with speed u and returns to it at point B. Disregarding gravity the maximum value of AB is

An infinite plane sheet of positive charge has surface charge density sigma . A metallic ball of mass m and charge +Q is attached to a thred and is tied to a point A on the sheet PQ . The angle theta made by the string with plane sheet is in equilibrium is

A long thin flat sheet has a uniform surface charge density sigma . The magnitude of the electric field at a distance .r. from it is given by

An empty thick conducting shell of inner radius a and outer radius b is shown in figure. If it is obseved that the inner face of the 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)