When a 10 μC charge is enclosed by a closed surface, the flux passing through the surface is φ. Now another 10 μC charge is placed inside the closed surface. The flux passing through the surface is then .

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(3) 2φ. Given: 10 μC inside gives flux φ; another +10 μC is added inside. Idea: Gauss's law, φ=(qᵢₙ)/(ε₀), so the flux is proportional to the net enclosed charge. Before: qᵢₙ=10 μC, flux φ. After: qᵢₙ=10+10=20 μC, twice as much. So the flux becomes 2φ.

When a 10 μC charge is enclosed by a closed surface, the flux passing through the surface is φ. Now another 10 μC charge is placed inside the closed surface. The flux passing through the surface is then ______.

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Why the other options are wrong