5. (a) The capacitance of a parallel-plate capacitor is given by C= ε0A/d, where Ais the area of each plate and dis the plate separation. Since the plates are circular, the plate area is A = πR2, where Ris the radius of a plate. Thus, ()( )2122210038.85 10F m8.2 10 m1.44 10F 144pF.
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