[填空题]
A homemade capacitor is assembled bgoh dru5lk-gk*8 w13 k7qm;yqy placbs)pem /bt0gaj.7 pa2ing two 9-in. pie pans 5 cm apart and connecting them to the opposite terminals of0amjb7/2bgp.s a) e tp a 9-V battery. Estimate
(a) the capacitance, $ \times10^{-12 }\,F$
(b) the charge on each plate, $ \times10^{-11 }\,C$
(c) the electric field halfway between the plates, V/m
(d) the work done by the battery to charge the plates. $ \times10^{ -10}\,J$
(e) Which of the above values change if a dielectric is inserted?