Chapter 16, Problem 78P

(a)

To determine

Draw the field lines for a parallel plate capacitor and explain why most of the charges are concentrated on the inner surface of plates.

(b)

To determine

Prove that the electric field between the plates $E=\frac{q}{{\epsilon }_{0}A}=\frac{\sigma }{{\epsilon }_0}$ using Gauss’s law.

(c)

To determine

Check whether the result of part (b) agree or contact with the result of problem 77.

(d)

To determine

Arrive at the result $E=\frac{\sigma }{{\epsilon }_0}$ using the principle of superposition and the result of problem 76.