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Q.

The inward and outward electric flux from a closed surface are respectively 8 x 103 and 4 x 103 units.  Then the net charge inside the closed surface is

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a

−4×103ε0coulomb

b

−4×103ε0 coulomb

c

4×103ε0 coulomb

d

4×103 coulomb

answer is B.

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Detailed Solution

Here Φ=4×103−8×103                     =−4×103According to Gauss's law,Φ=1ε0×q or q=ε0Φ∴ q=−4×103ε0.
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The inward and outward electric flux from a closed surface are respectively 8 x 103 and 4 x 103 units.  Then the net charge inside the closed surface is