Identical charges – q each are placed at 8 corners of a cube of each side b. Electrostatic potential energy of a charge + q which is placed at the centre of cub will be
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a
−42q2πε0b
b
−82q2π ε0b
c
−4q23πε0b
d
−82q23πε0b
answer is C.
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Detailed Solution
Length of body diagnonal =3b. ∴ Distance of centre of cube from each corner, r=32bTotal P.E. of charge + q at the centre=8q(−q)4πε0r=−8q24πε0(3b/2)=−4q2πε03b