Physics · 2026
JEE Main · 4 April 2026, Shift 2 · Q40
A magnetic field vector in an electromagnetic wave is represented by B =B_0 sin (2 π v t-(2 π x)/(λ)) j. Its associated electric field vector is ____.
A magnetic field vector in an electromagnetic wave is represented by $\displaystyle \vec{B}=B_0 \sin \left(2 \pi v t-\frac{2 \pi x}{\lambda}\right) \hat{j}$. Its associated electric field vector is $\displaystyle \_\_\_\_$.
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle \vec{E}=-v \lambda B_0 \sin \left(2 \pi v t-\frac{2 \pi x}{\lambda}\right) \hat{k}$
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.