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The induced electric field for a circular loop of radius \( \mathrm{r} \) placed in time varying magnetic field is:
\( \mathrm{P} \)
(1) \( \pi \mathrm{r} \frac{\mathrm{dB}}{\mathrm{dt}} \)
(2) \( \frac{-\mathrm{r}}{2} \frac{\mathrm{dB}}{\mathrm{dt}} \)
W
(3) \( \frac{\mathrm{rdB}}{\mathrm{dt}} \)
(4) \( \frac{\pi \mathrm{r}^{2} \mathrm{~dB}}{\mathrm{dt}} \)
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