A point charge +4C is at the mid point of a face of a cube. Another point charge -4C is at a corner of the cube. Then net electric flux over the surfaces of the cube is
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a
45ε0v-m
b
2ε0v-m
c
32ε0v-m
d
54ε0v-m
answer is C.
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Detailed Solution
Qnet = Net charge enclosed by the surface of the cube.=+42C+-48C=+32C∴ϕE=Qnetε0=32ε0v-m