Electromagnetic Waves

JEE Main level, single correct, medium

133 of 165

Question 133 of 165

An electromagnetic wave with frequency ω\omega and wavelength λ\lambda travels in the +y+y direction. Its magnetic field is along +x+x-axis. The vector equation for the associated electric field (of amplitude E0E_0 ) is

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Answer: (C) E⃗=E0cos⁡(ωt−2πλy)z^\vec{E}=E_0 \cos \left(\omega t-\frac{2 \pi}{\lambda} y\right) \hat{z}

In an electromagnetic wave electric field and magnetic field are perpendicular to the direction of propagation of wave. The vector equation for the electric field is
E⃗=E0cos⁡(ωt−2πλy)z^\vec{E}=E_0 \cos \left(\omega t-\frac{2 \pi}{\lambda} y\right) \hat{z}

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