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**Maxwell's Equation HELP!**

This is one of the Maxwell's Equations that I can't understand:

[tex]\oint[/tex] E.dl = -[tex]\int[/tex] dB/dt .dS

From what I understand, [tex]\int[/tex]E.dl gives the potential difference along the line. Therefore [tex]\oint[/tex]E.dl should always equal to zero because it is the potential difference of a point compared with itself..is my logic right?

So how can Maxwell's equation [tex]\oint[/tex] E.dl = -[tex]\int[/tex] dB/dt .dS

be valid when the surface integral of dB/dt is not zero??

Can someple please explain this to me