In the figure below, two parallel-plate capacitors A and B are connected in parallel across a 600 V battery. Each plate has area 70.0 cm2; the plate separations are 3.30mm. Capacitor A is filled with air; capacitor B is filled with a dielectric of dielectric constant ? = 2.80.
(a) Find the magnitude of the electric field within the dielectric of capacitor B.
(b) Find the magnitude of the electric field within the air of capacitor A.
(c) What is the free charge density ? on the higher-potential plate of capacitor A?
(d) What is the free charge density ? on the higher-potential plate of capacitor B?
(e) What is the induced charge density ?' on the top surface of the dielectric?