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Physics - EM Waves Question with Solution | TestHub

PhysicsEM WavesElectromagnetic wavesEasy2 minQB

PhysicsEasysingle choice

An electromagnetic wave with frequency $ω$ and wavelength $λ$ travels in the +y direction. Its magnetic field is along +x-axis. The vector equation for the associated electric field (of amplitude $E_{0}$ ) is :-

Options:

Answer:

Solution:

Propagation is along $+ y$ , so the phase must be $(ω t - 2 π y / λ)$ .

With $B$ along $+ x$ , $E \times B$ must point along $+ y$ : $\overset{z}{^} \times \overset{x}{^} = \overset{y}{^}$ , so $E$ is along $+ z$ .

Hence $E = E_{0} cos (ω t - 2 π y / λ) \overset{z}{^}$ . Answer: (D).

Stream:JEESubject:PhysicsTopic:EM WavesSubtopic:Electromagnetic waves

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