The magneticfieldan electromangeticwavein a substanceis givenbyB = ( 2 xx 10^(-6) T) cos[ pi( 0.04 xx 10^7t)]. Findthe electromagneticwavespeed.

The magneticfieldan electromangeticwavein a substanceis givenbyB = ( 2

1.	The magneticfieldan electromangeticwavein a substanceis givenbyB = ( 2 xx 10^(-6) T) cos[ pi( 0.04 xx 10^7t)]. Findthe electromagneticwavespeed.
Answer» Solution :Comparingthe givenequationwith thestandardwaveequation`B=B_0 cos( omegat+ k x)` we have ` , omega= PI XX 10^7rad // s andk =pixx ( 0.04 ) m^(-1)` ` therefore ` speedof electromangeticwavein thismedium is ` V=(omega )/(k)= 2.5xx 10^8 m/s`

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The magneticfieldan electromangeticwavein a substanceis givenbyB = ( 2 xx 10^(-6) T) cos[ pi( 0.04 xx 10^7t)]. Findthe electromagneticwavespeed.

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