Question

A parallel-plate capacitor initially has capacitance C. What is the capacitance after each of the following single changes is

made.

Part A

What is the capacitance after the plate separation distance in the initial capacitor was tripled?

ANSWER:

2/3C

3C

C

C/3

Part B

What is the capacitance after the material with dielectric constant к inserted into the initial capacitor?

ANSWER:

O кC

O к-1/к C

O C

O C/к

Part C

What is the capacitance after the potential difference across plates in the initial capacitor was tripled?

ANSWER:

O C/3

O 2/3C

O C

O 3C

Part D

What is the capacitance after the plate area in the initial capacitor was doubled?

ANSWER:

O C

O 2C

O C/2

O 3/2 C

Part E

What is the capacitance after the applied emf in the initial capacitor increased until the plate charge doubled?

O C

O C/2

O 2C

O 3/2 C