The mass of an electron is 9.11*10-31kg,that of a proton of mass is 1.67*10^-27kg.find the ratio of Fe/Fg of the electric feild and gravitional feild exerted by electron and proton

Electrostatics question based on earthing of spherical shell

an object has a charge of 2c and gains 10^19 electrons. the net chaarge on the object becomes??

A wire with a linear charge density lambda forms a quarter of a cjrclenof radius R and is placed asa shown in thefigure with its centre of curvature at the origin O the electric field at O will be

Find the value of q so that system remains in equilibrium.. figure attached below

Find the value of q so that system remains in equilibrium