a point chargeQis located on the axis of a disc of radiusRat a distance b from the plane of the disc .Show that if one-fourth of the electric flux from the charge passes through the disc ,then R=root3b
a point chargeQis located on the axis of a disc of radiusRat a distance b from the plane of the disc .Show that if one-fourth of the electric flux from the charge passes through the disc ,then R=root3b