#

The circuit shows a rectangular loop is connected to an a c voltage source V sub s of t with polarity positive to negative in the left branch and a capacitor in the right branch. The cross-section of the loop’s top branch is labeled imaginary surface S sub 1, whereas the cross-section of the capacitor is labeled, imaginary surface S sub 2. A current I sub 1 equals I sub start expression 1 c end expression flows rightward in the top branch. The displacement current I sub start expression 2 d end expression flows downward along an electric field E across the plates of capacitor.