Identical charges (-q) are placed at each comer of a cube of side b then electrical potential energy of charge (+q) which is placed at the centre of the cube will be :
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a
-42q2πε0b
b
-82q2πε0b
c
-4q23πε0b
d
82q24πε0b
answer is C.
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Detailed Solution
Distance of each charge placed at comer from the centre of cube=3b2So, potential energy = 8 x 14πε0q(-q)3b2=-4q23πε0b