Shown in the figure is a circular loop of radius r and resistance R. A variable magnetic field of induction \[B={{B}_{0}}{{e}^{-t}}\]is established inside the coil. If the key (K) is closed, the electrical power developed right after closing the switch is equal to.

\[\frac{B_{0}^{2}\pi {{r}^{2}}}{R}\]

\[\frac{{{B}_{0}}10{{r}^{3}}}{R}\]

\[\frac{B_{0}^{2}{{\pi }^{2}}{{r}^{4}}R}{5}\]

\[\frac{B_{0}^{2}{{\pi }^{2}}{{r}^{4}}}{R}\]

Shown in the figure is a circular loop of radius r and resistance R. A

1.	Shown in the figure is a circular loop of radius r and resistance R. A variable magnetic field of induction \[B={{B}_{0}}{{e}^{-t}}\]is established inside the coil. If the key (K) is closed, the electrical power developed right after closing the switch is equal to.
A.	\[\frac{B_{0}^{2}\pi {{r}^{2}}}{R}\]
B.	\[\frac{{{B}_{0}}10{{r}^{3}}}{R}\]
C.	\[\frac{B_{0}^{2}{{\pi }^{2}}{{r}^{4}}R}{5}\]
D.	\[\frac{B_{0}^{2}{{\pi }^{2}}{{r}^{4}}}{R}\]
Answer» E.