Question

A 27.5 nF air-filled parallel plate capacitor is connected in series with a 1.75 kΩ resistor and a battery of emf 36.0 V.

(a) Determine the final charge on the capacitor.

C

(b) Once the capacitor is fully charged and there is no current in the circuit, a sheet of plastic with a dielectric constant of 2.80 is introduced in the gap between the plates of the capacitor, completely filling the gap. If the area of each plate is

0.275 m2

what is the electric field inside the plastic immediately after it is inserted (before there is any change in the charge on the plates of the capacitor)?

(c) Take a moment to think about why current starts to flow after the plastic is inserted and apply the loop rule to find a round trip potential difference equation for the circuit just after the plastic is inserted. Determine the initial current through the resistor immediately after the plastic is inserted.

mA

(d) Determine the final charge on the positive plate of the capacitor with the dielectric.

Answer 1

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