QJEEM20Ph022c: JEE Main 2020 Physics - Class 12 JEEM20Ph022c Solution: If the magnetic field in a plane electromagnetic wave is given…

Question

Verified Solution • 2025–26 Session moderate

If the magnetic field in a plane electromagnetic wave is given by

\vec{B}

= 3

\times

10^-8 sin(1.6

\times

10³x + 48

\times

10¹⁰t)

\hat{j}

T, then what will be expression for electric field ?

Accepted Answer

Given

\vec{B}

= 3

\times

10^-8 sin(1.6

\times

10³x + 48

\times

10¹⁰t)

\hat{j}

T

We know,

\frac{E_{0}}{B_{0}} = c

\Rightarrow

E₀ = (3

\times

10^-8)

\times

(3

\times

10^-8) = 9 V/m

∴

\vec{E}

= (9sin(1.6

\times

10³x + 48

\times

10¹⁰t)

\hat{k}

V/m)

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