Questions
In an electromagnetic wave in free space the root mean square value of the electric field is . The peak value of the magnetic field is
a
2.83×10-8 T
b
0.70×10-8 T
c
4.23×10-8 T
d
1.41×10-8 T
detailed solution
Correct option is A
Given: Erms=6Vm-1ErmsBrms=c or Brms=ErmscBrms=63×108=2×10-8 T Since, Brms=Bo2 where Bo is the peak value of magnetic field. ∴Bo=Brms2=2×10-8×2 TBo≈2.83×10-8 TTalk to our academic expert!
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In an electromagnetic wave, the electric field oscillates sinusoidally with amplitude The RMS value of oscillating magnetic field will be
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