Implement the following circuit on your protoboard.

Measure $I_1$:$l_1=q,0\mathrm{.}1$ MA

X$.$ Measure $I_2$:$I_2=q,$

$0\mathrm{.}2mA$

Calculate $I_3$:$I_3=q,0\mathrm{.}2$ mA $q,$