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  4. Electric charges + 10μ C, + 5μ C, - 3 μ C and + 8 μ C are placed at the corners of a square of side √2 m. The potential at the centre of the square (V) is

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Q. Electric charges $+ 10\mu C, + 5\mu C, - 3 \mu C\, and\, + 8 \mu C$ are placed at the corners of a square of side $\sqrt2\,m$. The potential at the centre of the square (V) is

KCETKCET 1999Electrostatic Potential and Capacitance

Solution:

V = $9 \times 10^9 \left( \frac{10 \times 10^{-6}}{1} + \frac{5 \times 10^{-6}}{1} - \frac{3 \times 10^{-6}}{1} + \frac{8 \times 10^{-6}}{1} \right)$
= 1.8 $\times 10^5$ V

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