Question

What is the formula of incident power and average power density of a plane wave

Answer 1

Answer:

We know that,

The energy density (energy per unit volume) in an electric field E in vacuum is given by

U=

2

1

ε

0

E

2

where ε

0

=8.86×10

−12

C

2

/N−m

2

Given : E=1V/m

U=

2

1

×8.86×10

−12

×(1)

2

U=4.43×10

−12

So, the average energy density of magnetic field

U=

2

4.43×10

−12

U=2.21×10

−12

J/m