Three vertices of a square of side carry identical charges
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
Three vertices of a square of side a carry identical charges +Q. A fourth charge qx is placed at the remaining vertex. For the total electric potential energy of the system to be zero, qx must be
(a) −2Q
(b) −43Q
(c) −Q
(d) +Q