Point charges +2 µC and –18 µC are fixed 60 cm apart on a straight line in air
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
Point charges +2 µC and –18 µC are fixed 60 cm apart on a straight line in air. At which one of the following positions will the electric field be zero? (Distances are measured from the +2 µC charge.)
(a) 45cm between the two charges
(b) 30cm on the side extending beyond the +2μC charge, away from the −18μC charge
(c) 15cm between the two charges
(d) No finite point along the line joining the two charges