What is meant by the polarisation of electromagnetic waves ?

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  1. The polarisation is the direction of the electric current in an electromagnetic wave.
  2. The polarisation is the direction of the electric field in an electromagnetic wave
  3. The polarisation is the magnitude of the voltage in an electromagnetic wave.
  4. The polarisation is the inverse of the electric field in an electromagnetic wave

Answer (Detailed Solution Below)

Option 2 : The polarisation is the direction of the electric field in an electromagnetic wave
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Detailed Solution

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The direction of the electric field is considered as the polarization of the electromagnetic wave.

The direction of propagation of EM wave is given by the cross-product of the vector product of direction of electric field and magnetic field, i.e.

\({\hat a_p} = {\hat a_E} \times {\hat a_H}\)

This is an application of the Poynting theorem.

F2 Jai 17.11.20 Pallavi D18

The electric field and magnetic field are perpendicular to the direction of propagation of EM waves. 

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