JEE Main 2026 Apr 2 Shift 2, Physics Q12: Electromagnetic Waves

JEE Main2026Apr 2, Shift 2Physics

An electromagnetic wave travels in free space along the $x$ -direction. At a particular point in space and time, $B = 2 \times 1 0^{- 7} \hat{j}$ T is associated with this wave. The value of corresponding electric field $E$ at this point is ________V/m.

A
$60 \hat{k}$
B
$- 60 \hat{k}$
C
$30 \hat{k}$
D
$- 600 \hat{k}$

Solution

In an EM wave, $E = B \times c$ where $c = c \hat{i}$ for propagation along $+ x$ .

$E = (2 \times 1 0^{- 7} \hat{j}) \times (3 \times 1 0^{8} \hat{i}) = 60 (\hat{j} \times \hat{i}) = - 60 \hat{k}$ V/m.

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JEE Main 2026 Apr 2 Shift 2, Physics Q12: Electromagnetic Waves

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