Question

Four charges , each equal to -Q are placed at the four corners of a square and a charge q is at centre. If the system is in equilibrium, the value of q is :
(a) -Q/4 ( 1+2√2)
(b) Q/4 ( 1+2√2)
(c) -Q/2 ( 1+2√2)
(d) Q/2 (1+2√2)

Answer 1

Answer:

a is the correct answer