Question -
Four charges are arranged at the corners of a square ABCD , as shown in the adjoining figure. The force on the charge kept at the centre O is
Options:
A .  Zero
B .  Along the diagonal AC
C .  Along the diagonal BD
D .  Perpendicular to side AB
Answer: Option C : C We put a unit positive charge at O. Resultant force due to the charge placed at A and C is zero and resultant charge due to B and D is towards D along the diagonal BD.
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