What is the electric potential of uniformly charged rod of lenght ‘a‘ at point ‘A(0,0)‘ and referent point is at infinity? The rod lies on x-axis. Could you show the steps? Thanks for replies.

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