Physics · 2021
JEE Main · 26 February 2021, Shift 1 · Q26
A radiation is emitted by 1000 W bulb and it generates an electric field and magnetic field at P, placed at a distance of 2 m. The efficiency of the…
A radiation is emitted by $\displaystyle 1000$ W bulb and it generates an electric field and magnetic field at P , placed at a distance of $\displaystyle 2$ m . The efficiency of the bulb is $\displaystyle 1.25 \%$. The value of peak electric field at P is $\displaystyle x \times 10^{-1} \mathrm{~V} / \mathrm{m}$. Value of $\displaystyle x$ is \_\_\_\_. (Rounded-off to the nearest integer)
[Take $\displaystyle \varepsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1} \mathrm{~m}^{-2}, \mathrm{c}=3 \times 10^8 \mathrm{~ms}^{-1}$ ]
Official answer
137
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.