Physics · 2025
JEE Main · 23 January 2025, Shift 2 · Q39
A plane electromagnetic wave of frequency 20 MHz travels in free space along the +x direction. At a particular point in space and time, the electric…
A plane electromagnetic wave of frequency $\displaystyle 20$ MHz travels in free space along the $\displaystyle +x$ direction. At a particular point in space and time, the electric field vector of the wave is $\displaystyle \mathrm{E}_y=9.3 \mathrm{Vm}^{-1}$. Then, the magnetic field vector of the wave at that point is
Official answer
From NTA’s final answer key for this paper.
(3)
$\displaystyle B_z=3.1 \times 10^{-8} \mathrm{~T}$
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JEE Main 2025 Physics question, with the answer from NTA’s final answer key. Where our answers come from.