Q.

Eight charges, each of magnitude q are placed at the vertices of a cube placed in vacuum. Electric potential at the centre of the cube due to this system of charges is: ( ε0 is permittivity of vacuum and a is length of each side of the cube)

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a

2qπε0a

b

zero

c

3qπε0a

d

4q3πε0a

answer is B.

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Detailed Solution

V=8kq3a2=16kq3a=4q3πε0a

Where 3a is the body diagonal  and distance of the center from the corner is 3a2

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Eight charges, each of magnitude q are placed at the vertices of a cube placed in vacuum. Electric potential at the centre of the cube due to this system of charges is: ( ε0 is permittivity of vacuum and a is length of each side of the cube)