Four point charges qA = 2 μC, qB = – 5 μC, qc = 2 μC, and qD = –5 μC are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 1 μC placed at the centre of the square?
Suppose a square ABCD with each side of 10 cm and centre 0. At the centre, the charge of 1 μC is placed.
As q
A = q
c, the charge of 1 μC experiences equal and opposite forces F
A and F
c due to charges q
A and q
C.
At the same time, the charge 1 μC experiences equal and opposite forces. F
B and F
D due to equal charges q
B and q
D at B and D. Thus, the net force on charge of 1 μC due to the given charges is zero.
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