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An electromagnetic wave of frequency 25 ...

An electromagnetic wave of frequency 25 MHz travels in free space along x-direction. At a particular point in space and time, `vecE= 6.3hatj` volt/metre. What is the value and direction of `vecB` of the wave at that point?

Text Solution

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Magnitude of magnetic field `vecB` ,
`B=E/c=6.3/(3xx10^8)=2.1xx10^(-8)Wb.m^(-2)`
Direction of wave propagation : x-axis
Direction of `vecE` : y-axis (unit vector is directed along `hatj` )
`therefore vecB` is directed along z-axis
`therefore vecB=(2.1xx10^(-8))hatkWb.m^(-2)`
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