Three particles, each having a charge of 10 μC are placed at the corners of an equilateral triangle of side 10 cm. The electrostatic potential energy of the system is (Given 14πε0=9×109N−m2/C2)
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a
Zero
b
Infinite
c
27 J
d
100 J
answer is C.
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Detailed Solution
For pair of charge U=14πε0⋅q1q2rUSystem=14πε010×10−6×10×10−610/100+10×10−6×10×10−610/100+10×10−6×10×10−610/100=3×9×109×100×10−12×10010=27 J