Consider a system of three charges 
, 
and 
placed at points A, B and C, respectively, as shown in the figure. Take O to be the centre of the circle of radius R and angle CAB = 60º.
A
The electric field at point O is 
directed along the negative x-axis.
directed along the negative x-axis.
B
The potential energy of the system is zero.
C
The magnitude of the force between the charges at C and B is 
.
.
D
The potential at point O is 
.
.
Text Solution
Verified by ExpertsThe correct answer is:
C
Net electric field due to both q/3 charges will get cancelled. Electric field due to 
will be directed in –ve axis
E = 
⇒ E = 
P.E. of system = 
P.E. of system 
0
Force between B and C
F = 
= 
(attractive) = 
Potential at O
V = 
= 0
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