Electromagnetism

Question 1

Finding capacitance

Answer 1

find field
find potential
use c = q/v

Question 2

How emf is produced

Answer 2

stationary circuit in time varying field
circuit moving in stationary field
cutting magnetic field

Question 3

lenz law

Answer 3

induced emf opposes change that caused it

Question 4

difference between electrostatic and electromotive

Answer 4

Edl = 0 electrostatic

Edl =! electromotive

Question 5

self inductance

Answer 5

current in a circuit self induces a flux

Question 6

Starting point for maxwells equations

Answer 6

differential ampere
differential gauss
gauss for magnetism
electromotive potential between point

Question 7

Relationship between e and b waves

Answer 7

mutally perpendicular

Question 8

What does poynting vector give

Answer 8

direction of power flux

Question 9

what does the magnitude of the poynting vector give

Answer 9

average values for e and b

Question 10

radiation pressure for absorbtion

Answer 10

N/c

Question 11

radiation pressure for reflection

Answer 11

2N/c

Question 12

what does dielectric do to E

Answer 12

reduces it by e0

Question 13

where does the polarisation field come from

Answer 13

net surface charge density