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NEET Class neet Answered

please answer this
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Asked by Prashant DIGHE | 27 Jan, 2020, 10:41: PM
answered-by-expert Expert Answer
Propagation direction of elecromagnetic wave is +z direction.
 
Hence direction of magnetic field and electric field are perpendicular to +z-direction.
 
In addition to that electric field and magnetic field are mutually perpendicular.
 
Magnitude of electric field and magnetic field are related as,  |E| / |B| = c  , where c is speed of light.
 
By considering all the above requirements of electric field and magnetic field in electromagnetic wave,
 
we get electric field E as ,  E = 15 × 10-8 begin mathsize 14px style i with hat on top end style V/m
( if E = -15 × 10-8 begin mathsize 14px style i with hat on top end style V/m , then propagation direction of electromagnetic wave become -z direction.
Hence we can not choose that option )
Answered by Thiyagarajan K | 28 Jan, 2020, 07:56: AM
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