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MCQEasyJEE Main 2026 · 28 January, Shift 2Characteristics of EM Waves

Physics Question from JEE Main 2026 · 28 January, Shift 2

A plane electromagnetic wave is moving in free space with velocity c=3×108 m/sc=3\times10^{8}\, \text{m/s} and its electric field is given as E⃗=54sin⁡(kz−ωt) j^ V/m,\vec E = 54\sin(kz-\omega t)\,\hat{j}\, \text{V/m}, where j^\hat{j} is the unit vector along the yy-axis. The magnetic field B⃗\vec B of the wave is:

  • A

    −1.8×10−7sin⁡(kz−ωt) i^ T-1.8\times10^{-7}\sin(kz-\omega t)\,\hat{i}\, \text{T}

  • B

    1.4×10−7sin⁡(kz−ωt) k^ T1.4\times10^{-7}\sin(kz-\omega t)\,\hat{k}\, \text{T}

  • C

    1.4×10−7sin⁡(kz−ωt) i^ T1.4\times10^{-7}\sin(kz-\omega t)\,\hat{i}\, \text{T}

  • D

    +1.8×10−7sin⁡(kz−ωt) i^ T+1.8\times10^{-7}\sin(kz-\omega t)\,\hat{i}\, \text{T}

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