question_answer

Give two characteristics of electromagnetic waves. Write the expression for velocity of electromagnetic waves in terms of permittivity and permeability of the medium.

Answer:

Characteristics of Electromagnetic Waves

(i) Electromagnetic waves travel in free space with speed of light, \[c=3\times {{10}^{8}}m/s\]

(ii) Electromagnetic waves are transverse in nature.

Expression for velocity of EM waves in vacuum, \[c=1/\sqrt{{{\mu }_{0}}{{\varepsilon }_{0}}}.\]