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Total flux from charges enclosed by a closed surface

This type of question, asked 2 times: 4 May 2023 S2, 22 Apr 2025 S1. All 2 questions below, oldest first.

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  1. Question 1

    4 May 2023 S2

    1
    Two surfaces A and B are enclosing the charges as shown below. The total normal electric induction (T.N.E.I) through the surfaces A and B are respectively.

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  2. Question 2

    22 Apr 2025 S1

    7
    Four charges 2 μC,−3 μC,4 μC,−4 μC2\ \mu C, - 3\ \mu C,4\ \mu C, - 4\ \mu C and −1μC- 1\mu C are enclosed by the Gaussian surface of radius 2 m . Net outward flux through the Gaussian surface is (in μV−m\mu V - m ) [ ε0=\varepsilon_{0}= permittivity of free space]

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