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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 |
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Answer» I = \(\frac{1}{2}\)\(\epsilon_0 \epsilon^2_0\) I = \(\frac{P}{AC}\) \(\frac{P}{C\times4\pi R^2}\) = \(\frac{1}{2}\)\(\epsilon_0 \epsilon^2_0\) \(\epsilon^2_0\) = \(\frac{P}{2\pi \epsilon_0R^2C}\) \(\epsilon_0 \) = \(\sqrt\frac{P}{2\pi \epsilon_0 R^2 C}\) |
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