Electromagnetic wave equation E=E0cos(kw−ωt) Speed of electromagnetic wave v=kω Given, equation E=40cos(kz−6×108t)i Comparing Eqs. (i) and (ii), we get ω=6×108 and E0=40i Here, wave factor k=vω=3×1086×108=2 m−1
NEET UG 2012 — Physics Electromagnetism
The electric field associated with an electro magnetic wave in vacuum is given by E=i 40cos(kz−6×108t), where E, z and t are in volt/m, metre and second respectively. The value of wave vector k is
Held on 30 Apr 2012 · Verified 9 Jul 2026.
2 m−1
0.5 m−1
6 m−1
3 m−1
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