InterviewSolution
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InterviewSolution
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A plane electromagentic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time , E=6.3 `hatj` V/m . What is B at the point ? |
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Answer» Using Eq. `B_(0)=[E_(0)//C]` the magnitude of B is `B=(E)/(c)` `=(6.3 V//m)/(3xx10^(8) m//s)=2.1xx10^(-8)T` To find the direction , we not that E is along y-direction and the wave propagates along x-axis. Therefore, B should be in a direction perpendicular to both x-and y-axes.Using vector algebra, `E xx B` should be along x-direction . Since `(+hatj)xx(+hatk)=i`, B is along the z-direction . Thus, B=`2.1xx10^(-8) hat kT` |
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