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Physics Question on Electric Charge

Electric charges +10μC,+5μC,−3μC and +8μC+ 10\mu C, + 5\mu C, - 3 \mu C\, and\, + 8 \mu C are placed at the comers of a square of side 2 m\sqrt2\,m. The potential at the centre of the square (V) is

A

18×10518\times 10^5

B

1.8×1061.8\times 10^6

C

1.8

D

1.8×1051.8\times 10^5

Answer

1.8×1051.8\times 10^5

Explanation

Solution

V = 9×109(10×10−61+5×10−61−3×10−61+8×10−61)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 ×105\times 10^5 V