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Identify the polarisation of the wave given, Ex = 2 cos wt and Ey = sin wt. The phase difference is -90^0.

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Identify the polarisation of the wave given, Ex = 2 cos wt and Ey = sin wt. The phase difference is -90^0.

(a) Left hand circularly polarised

(b) Right hand circularly polarised

(c) Left hand elliptically polarised

(d) Right hand elliptically polarised

This question was posed to me at a job interview.

My question is taken from Types of Polarization in division EM Wave Propagation of Electromagnetic Theory

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Right choice is (d) Right hand elliptically polarised

The best explanation: The magnitude of the Ex and Ey components are not same. Thus it is elliptical polarisation. For -90 phase difference, the polarisation is right handed. In other words, the rotation is in anti-clockwise direction. Thus the polarisation is right hand elliptical.

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