Question

(a) Show that each plate of a parallel-plate capacitor exerts a force on the other of...

(a) Show that each plate of a parallel-plate capacitor exerts a force on the other of magnitude

F = 1 Q2 2ε0A

Do this by calculating dU/dx, where U is the stored (potential) energy in the capacitor. (b) Why does F = QE give the wrong answer? (First, verify that it does give the

wrong answer!)

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