Five ball numbered 1 to 5 are suspended using separate threads pair (1,2) (2,4) and (4,1)show electrostatic attraction while pair (2,3)and (4,5)show repulsion therefore ball 1 must be

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