Charges 5 μC, –2 μC, 3 μC and –9 μC are placed at the corners A, B, C and D of a square ABCD of side 1 m. The net electric potential at the centre of the square is
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a
–27 kV
b
–272 kV
c
– 90 kV
d
Zero
answer is B.
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Detailed Solution
Vnet=14πε0Qnetd =9 x 109 5-2+3-9 x 10-61/2 =9 x 10+3-32=-272 kV