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  • (a) Draw a graph of a linearly polarised em wave propagating in the z-direction showing the directions of the oscillating electric and magnetic fields. (b) Write the relations (i) between the speed of light and the amplitudes of electric and

(a) Draw a graph of a linearly polarised em wave propagating in the z-direction showing the directions of the oscillating electric and magnetic fields.

(b) Write the relations (i) between the speed of light and the amplitudes of electric and magnetic fields, (ii) for the speed of em waves in terms of a permittivity \varepsilon _{0}, and magnetic permeability, \mu _{0},  of the medium.

 

 

 
 
 
 
 

Answers (1)

(b) (i) The relation between the speed of light and the amplitude of electric and magnetic fields.

E_{x}= E_{0}\sin (k{z}-wt)

B_{y}= E_{0}\sin (k{z}-wt)

B_{0} =\frac{ E_{0}}{C}

(ii) The relation for the speed of em wave in terms of \varepsilon _{0} and \mu _{0} of the medium 

Speed of propagation of the wave 

 c=\frac{1}{\sqrt{\mu_{o}\varepsilon _{0}}}

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