A plane electromagnetic wave |ElectromagneticWaveJEEMain2019

JEE MAIN 2019

08-04-2019 S1

Question

A plane electromagnetic wave travels in free space along the x-direction. The electric field component of the wave at a particular point of space and time is E = 6 Vm–1 along y-direction. Its corresponding magnetic field component, B would be :

Select the correct option:

$2 \times 10^{-8} \mathrm{~T}$ along y-direction

$6 \times 10^{-8} \mathrm{~T}$ along z -direction

$2 \times 10^{-8} \mathrm{~T}$ along z-direction

$6 \times 10^{-8} \mathrm{~T}$ along x -direction

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$$ B_0=\frac{E_0}{c}=\frac{6}{3 \times 10^8}=2 \times 10^{-8} \mathrm{~T} $$ Propagation direction $=\hat{E} \times \hat{B}$ $$ \begin{aligned} & \hat{\mathrm{i}}=\hat{\mathrm{j}} \times \hat{\mathrm{B}} \\ & \Rightarrow \hat{\mathrm{~B}} \times \hat{\mathrm{k}} \end{aligned} $$

Question Tags

JEE Main

Physics

Easy

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