10 charged particle are kept on the x-axis at a distance 10 mm 20 Amma 30 mm and so on UPTU 100 mm the first particle and stars 10 to the power minus 8 c and so on please check the attachment

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