Four charges 
, and 
are placed on 
plane at the points whose coordinates are 
and 
respectively.
The electric field due to these charges at a point 
, where 
, will be
Text Solution
Verified by ExpertsB
The four charges can be considered two dipoles of equal magnitude and directed along the +x axis and +y axis.
The magnitude of dipole moment 
(distance between positive and negative charges on x -axis)
The resultant dipole moment of these two dipoles with be, 
The direction of the resultant dipole moment will be at 
from the 
-axis
The distance of the point ( 
) from the dipole is 
The resultant electric field is
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