A resistor with resistance R and an air-gap capacitor of capacitance C are connected in series to a battery (whose strength is
“emf”).
(a) What is the final charge on the positive plate of the capacitor?
(b) After fully charging the capacitor (so there is no current), a sheet of plastic whose dielectric constant is K is inserted
into the capacitor and fills the gap. Explain why a current starts running in the circuit. You can base your
explanation either on electric field or on electric potential, whichever you prefer.
(c) What is the initial current through the resistor just after inserting the sheet of plastic?
(d) What is the final charge on the positive plate of the capacitor after inserting the plastic?
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