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NEET Class neet Answered

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Asked by Prashant DIGHE | 26 Jan, 2020, 09:39: PM
answered-by-expert Expert Answer
Polarisation direction is begin mathsize 14px style k with hat on top end style means, electric field is in z-direction
Waveform given in option (1) is correct due to following reason
 
(i) magnetic field direction(1/√2)( begin mathsize 14px style i with hat on top end style - begin mathsize 14px style j with hat on top end style ) is perpendicular to propagation direction (1/√2)( begin mathsize 14px style i with hat on top end style + begin mathsize 14px style j with hat on top end style )   as well as electric field direction begin mathsize 14px style k with hat on top end style
 
(ii) phase of the waveform indicates wave is propagating in the +ve direction of (1/√2)( begin mathsize 14px style i with hat on top end style + begin mathsize 14px style j with hat on top end style
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Waveform given in option (2) is wrong due to following reason
 
magnetic field direction and wave propagation direction can not be same, they are perpendicular to each other
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Waveform given in option (3) is correct due to following reason
 
magnetic field direction and polarization direction ( or electric field direction) can not be same, they are perpendicular to each other
 
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Waveform given in option (4) is correct due to following reason
 
phase of the waveform indicates wave is propagating in the -ve direction of (1/√2)( begin mathsize 14px style i with hat on top end style + begin mathsize 14px style j with hat on top end style )
Answered by Thiyagarajan K | 26 Jan, 2020, 11:10: PM
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