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Which of the following Maxwell's equation is valid for time varying conditions but not valid for static conditions:

1. ∫ ⋅ l d B = μ 0 I
2. ∫ ⋅ l d E = 0
3. ∫ ⋅ dA D = Q
4. ∫ ∂ φ ∂ − = ⋅ t d E B l

Correct answer: ∫ ∂ φ ∂ − = ⋅ t d E B l

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