Four charges 
and -2q are placed at the corners of a square 
respectively. The force on a unit positive charge kept at the center O is
Text Solution
Verified by ExpertsThe correct answer is:
D
Magnitude as well as polarities of charges at points A and C are same. Therefore forces at O, due to these charges cancel each other. Moreover, polarities of
the charges at B and D are opposite; therefore force on charge kept at the center is along the diagonal BD.
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