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Question
Three point charges - $$90 \times 10^-9 C, 20 \times 10^-9$$ C and $$40 \times 10^-9$$ C are situated at the corner A,B and C of isosceles triangle ABC. Calculate the resultant potential at the midpoint of BC if AB = AC = 0.08 m and BC = 0.04 m.
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