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Q.

Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is 8.0 x 103 NC-1m2. The net charge inside the box is

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a

zero

b

0.07 μC

c

0.08 μC

d

0.16 μC

answer is B.

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Detailed Solution

Φ=8⋅0×103NC−1m2 We know that Φ=q/ε0  or  q=ε0Φ ∴ q=8⋅85×10−12×8⋅0×103             =0.07×10−6C=0.07μC

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Careful measurement of the electric field at the surface of a black box indicates that the net outward flux through the surface of the box is 8.0 x 103 NC-1m2. The net charge inside the box is