The Class Notes

4 jan 2010

$Limit\ A\ \to \infty :$

$X_{0}\ ={\frac {1}{\beta }}X_{s}\ \Rightarrow V_{0}={\frac {R_{1}+R_{2}}{R_{1}}}V_{in}$

$X_{i}\ =0$

Drawing 1

$V_{in}\ =V_{0}({\frac {R_{1}}{R_{1}+R_{2}}})$.

$V_{0}\ ={\frac {1}{({\frac {R_{1}}{R_{1}+R_{2}}})}}V_{in}$

Magnetic Circuits

${\vec {F}}\ =q{\vec {v}}\times {\vec {B}}$

$d{\vec {F}}\ =Id{\vec {l}}\times {\vec {B}}$

${\mathcal {F}}=Hl_{1}+Hl_{2}$

$V\ =R_{1}I+R_{2}I$