three point charges 4q q and 2q are placed in a straight line of length 10 cm at points distance 0.5 cm 10 cm respectively.if the net force on charge 2q is zero,then calculate the value of q

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