or 
and 
are located at the
corners of a square ABCD of side 10 cm. What the force on a charge is of 
placed at the
centre of the Square?
Answer:
The
symmetry of the figure clearly indicates that 
charge will face
equal and opposite forces due to equal charges of 
placed at A and C.
Similarly, charge will face
equal and opposite forces due to 
charges placed at D
and B.
Thus,
net force = zero.
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