A transformer with toroidal core of permeability μ is shown in the figure. Assuming uniform flux density across the circular core cross-section of radius r R, and neglecting any leakage flux, the best estimate for the mean radius R is

\(\frac{{\mu V{r^2}N_P^2\omega }}{I}\)

\(\frac{{\mu I{r^2}{N_P}{N_S}\omega }}{V}\)

\(\frac{{\mu V{r^2}N_P^2\omega }}{{2I}}\)

\(\frac{{\mu I{r^2}N_P^2\omega }}{{2V}}\)

A transformer with toroidal core of permeability μ is shown in the fi

1.	A transformer with toroidal core of permeability μ is shown in the figure. Assuming uniform flux density across the circular core cross-section of radius r R, and neglecting any leakage flux, the best estimate for the mean radius R is
A.	\(\frac{{\mu V{r^2}N_P^2\omega }}{I}\)
B.	\(\frac{{\mu I{r^2}{N_P}{N_S}\omega }}{V}\)
C.	\(\frac{{\mu V{r^2}N_P^2\omega }}{{2I}}\)
D.	\(\frac{{\mu I{r^2}N_P^2\omega }}{{2V}}\)
Answer» E.

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A transformer with toroidal core of permeability μ is shown in the figure. Assuming uniform flux density across the circular core cross-section of radius r R, and neglecting any leakage flux, the best estimate for the mean radius R is

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