Four charges equal to – Q are placed at the four corners of a square and a charge q is at its center. If the system is in equilibrium the value of q is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
If all charges are in equilibrium , system is also in equilibrium.
Charge at center : charge q is in equilibrium because no net force acting on it corner charge :
If we consider the charge at corner B. This charge will experience following forces
,
Force at B away from the center = 
Force at B towards the center 
For equilibrium of charge at B, 
⇒ ⇒ 
⇒ ⇒ 
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