Question

The relative electric permittivity of a medium is 9 and the relative permeability is close to unity. What is the speed of em waves in the medium?

Answer 1

Explanation:

The speed of light in the medium, v=

μ

r

ϵ

r

c

=0.5×

(4)(9)

3×10

8

m/s

=10

8

m/s

Hence, the magnitude of electric field =vB=0.5×10

8

m/s×4.2×10

−8

T =2.1Vm

−1