Part 1 A parallel-plate capacitor has a plate area of 63 cm2 and a plate separat

ID: 2135426 • Letter: P

Question

Part 1

A parallel-plate capacitor has a plate area of

63 cm2

and a plate separation of 5.76 mm. A

potential di?erence of 7.74 V is applied across

the plates with only air between the plates. What is the capacitance before the dielectric is inserted?

Answer in units of F

Part 2

The battery is then disconnected, and a piece

of glass (with a dielectric constant 3.62) is

inserted to completely ?ll the space between

the plates What is the capacitance after the dielectric

is inserted?

Answer in units of F

Part 3

What is the charge on the plates before the

dielectric is inserted?

Answer in units of C

Part 4

What is the charge on the plates after the

dielectric is inserted?

Answer in units of C

Part 5

What is the potential di?erence across the

plates before the dielectric is inserted?

Answer in units of V

Part 6

What is the potential di?erence across the

plates after the dielectric is inserted?

Answer in units of V

1. C0 = eoA/d = 8.85*10^-12 * 63*10^-4/5.76mm = 9.67*10^-12 F

2. C= Kc0 = 3.62 *9.67 = 3.55*10^-11 F