Three point charges –Q, Q and Q are placed on a straight line with distance d between charges as shown. Find the magnitude of the electric field at the point P in the configuration shown which is at a distance a from middle charge Q in the system provided that a >> d. Take 2Qd = p.
Text Solution
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Sol.
a >> d so we can treat charge A and C as a dipole. So net electric filed at point P: 
or 
{dipole moment P = (2d) Q}
or 
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