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  • A radiation is emitted by  bub and it generates an electric field and magnetic fi

A radiation is emitted by 1000 \mathrm{~W} bub and it generates an electric field and magnetic field at P, placed at a distance of 2 \mathrm{~m}. The efficiency of the bur is 1.25 \%. The value of the peak electric field at P is

Option: 1

1.37 \ \mathrm{v} / \mathrm{m}


Option: 2

6.85 \ \mathrm{v} / \mathrm{m}


Option: 3

13.7 \ \mathrm{v} / \mathrm{m}


Option: 4

27.4 \ \mathrm{~v} / \mathrm{m}


Answers (1)

best_answer

\begin{aligned} & I_{\text {av. }}=\frac{1}{2} \epsilon_0 E_0^2 C \Rightarrow \frac{1.25}{100} \times \frac{1000}{4 \pi(2)^2}=\frac{1}{2} \times 8.85 \times 10^{-12} \\ & \times 3 \times 10^8 \times E_0^2 \\ & \Rightarrow E_0^2=187.4 . \\ & \Rightarrow E_0=13.7 \mathrm{~v} / \mathrm{m} . \end{aligned}

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Ritika Jonwal

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