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

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Identify the polarisation of the wave given, Ex = Exo cos wt and Ey = Eyo 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

The question was posed to me by my college director while I was bunking the class.

The above asked question is from Types of Polarization topic in division EM Wave Propagation of Electromagnetic Theory

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Correct choice is (c) Left hand elliptically polarised

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

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