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Suppose that the electric field part of an electromagnetic wave in vacuum is vec(E )={(3.1 N//C)cos [(1.8 rad//m)y+(5.4xx10^(6)rad//s)]}hat(i)Write an expression for the magnetic field part of the wave. |
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Answer» Solution :EQUATION for magnetic FIELD, `vec(B)=B_(0)cos (ky + omega t)hat(k)` `therefore vec(B)=1.033xx10^(-8)cos {(1.8 y+5.4xx10^(8)t)}hat(k) ""`….(8) Here if we take direction of `vec(B)` along `hat(k)` then only, direction of `vec(E )xx vec(B)=` direction of `hat(i)xx hat(k)=-hat(j)=` direction of propagation of given electromagnetic wave = direction of - Y axis. |
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