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Physics Question on Electrostatic potential

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

A

∮B⃗.dl⃗=μ0I∮\vec{B}.\vec{dl}=μ _0I

B

∮E⃗.dl⃗=−∂ϕB∂t∮\vec{E}.\vec{dl}=-\frac{\partialϕ_B}{\partial t}

C

∮D⃗.dA⃗=Q∮\vec{D}.\vec{dA}=Q

D

∮E⃗.dl⃗=0∮\vec{E}.\vec{dl}=0

Answer

∮E⃗.dl⃗=−∂ϕB∂t∮\vec{E}.\vec{dl}=-\frac{\partialϕ_B}{\partial t}

Explanation

Solution

The correct option is(B):∮E⃗.dl⃗=−∂ϕB∂t∮\vec{E}.\vec{dl}=-\frac{\partialϕ_B}{\partial t}