Two point charges of 5C and 20C are separated by a distance of 6m . Find the point on the line joining them at which electric field intessity is zero .

Question

$(a)\;2m \;from\; 5C \qquad(b)\;2m\;from\;20C\qquad(c)\;3m\;from\;5C\qquad(d)\;1m\;from\;5C$