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A point charge+2μC is placed at the centre of a sphere of radius 10cm. Another charge −2μC is kept at a distance of 20 cm from the centre of the sphere. Then electric flux through the surface of the sphere is

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a

3.26×1016V-m

b

2.26×1017V-m

c

4.18×1018V-m

d

5.12×1015V-m

answer is B.

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Detailed Solution

Qnet=Net charge enclosed by the sphere =2×10−6Coul∴By Gauss’s law, ϕE=Qnetε0=2×1068.85×10−12V-m=2.26×1017V-m

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