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Q.

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 (Given14πε0=9×109 N-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·q1q2r USystem =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

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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 (Given14πε0=9×109 N-m2/C2 ).