Capacitance

Question 1

What does a capacitor consist of

Answer 1

Two conductors insulated from each other. when a batter is connected one of the conductors gains electrons from the battery and the other loses electrons to the battery. Each plate gains an equal and opposite charge

Question 2

Capacitance equations(Victoria cross)

Answer 2

C=Q/V

Question 3

Electric potential energy stored in a capacitor

Answer 3

E=0.5QV=0.5CV^2

Question 4

How do thunder clouds link to capacitance

Answer 4

Imagine the ground and a thundercloud as a pair of charged plates.
As the cloud is charged a strong electric field exists
This means there is a potential difference between the two
V=Ed

Question 5

Energy stored by a thundercloud

Answer 5

Energy=0.5QEd

Question 6

Why does the discharge current decrease gradually to 0

Answer 6

The pd across the capacitor decreases as it loses charge

Question 7

What are dielectrics

Answer 7

Electrically insulating materials that increase the ability of a parallel plate capacitor to store charge

Question 8

How do dielectrics work

Answer 8

When places between the plates its molecules become polarised meaning the surface facing the negative plate gains positive charge

Question 9

How is more charge conserved in a dielectric system

Answer 9

Positive side attracts more electrons to the negative plate from the battery
Negative side pushes electrons back to the battery from the positive side

Question 10

What is relative permittivity

Answer 10

The ratio of the charge stored with a dielectric to the charge stored without
=Q/Qo=C/Co