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.
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