8.Electromagnetic waves
hard

$x$-દિશામાં પ્રસરતા સમતલ વીજ ચુંબકીય તરંગને $\mathrm{E}_y=\left(200 \mathrm{Vm}^{-1}\right) \sin \left[1.5 \times 10^7 \mathrm{t}-0.05 x\right]$ દ્વારા રજૂ કરવામાં આવે છે. તરંગની તીવ્રતા______ છે .

$\left(\epsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1} \mathrm{~m}^{-2}\right.$ લો.) 

A

 $35.4 \ \mathrm{Wm}^{-2}$

B

$53.1 \ \mathrm{Wm}^{-2}$

C

 $26.6 \ \mathrm{Wm}^{-2}$

D

 $106.2 \ \mathrm{Wm}^{-2}$

(JEE MAIN-2024)

Solution

$ \mathrm{I}=\frac{1}{2} \varepsilon_0 \mathrm{E}_0^2 \times \mathrm{c} $

$ \mathrm{I}=\frac{1}{2} \times 8.85 \times 10^{-12} \times 4 \times 10^4 \times 3 \times 10^8 $

$ \mathrm{I}=53.1 \mathrm{~W} / \mathrm{m}^2$

Standard 12
Physics

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