- A Determine The Initial Potential Difference Across The Capacitor 2 Marks B A Strip Of Material With Dielectric C 1 (38.64 KiB) Viewed 16 times
- A Determine The Initial Potential Difference Across The Capacitor 2 Marks B A Strip Of Material With Dielectric C 2 (63.04 KiB) Viewed 16 times
- A Determine The Initial Potential Difference Across The Capacitor 2 Marks B A Strip Of Material With Dielectric C 3 (63.04 KiB) Viewed 16 times
Consider a parallel-plate air capacitor (filled with air in-between) with square electrode plates of edge length 1 and plate separation d d << I), and are charged with Q and on the two plates. The plates are then disconnected from batteries. (a) Determine the initial potential difference across the capacitor. (2 marks) (b) A strip of material with dielectric constant K and dimensions *d*x (x < 1) is inserted in the air gap of the capacitor, as shown in the following figure. Determine the new capacitance, if the net charges on the plates remain uncharged. (Hint: treat the system containing two capacitors connected in parallel). (3 marks) (c) Determine the electric potential energy stored in the capacitor, before and after the insertion of the dielectric. (3 marks) (d) Suggest the origin of the energy change in (c). (2 marks) + + + ++ d к J-0