# EM waves question

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Assume that a lamp radiate power P uniformly in all directions. What is the magnitude of electric field strength at a distance r from the lamp??

This is a question from electromagnetic waves physics class 12

by (51.2k points)

I = $\frac{1}{2}$$\epsilon_0 \epsilon^2_0$

I =  $\frac{P}{AC}$

$\frac{P}{C\times4\pi R^2}$ = $\frac{1}{2}$$\epsilon_0 \epsilon^2_0$

$\epsilon^2_0$ = $\frac{P}{2\pi \epsilon_0R^2C}$

$\epsilon_0$ $\sqrt\frac{P}{2\pi \epsilon_0 R^2 C}$

by (31 points)
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Thank you so much