Multiple choice:

$18.-\backslash (\backslash$mathbf$\{5\}\backslash )$ points In the circuit shown in the figure, all the lightbulbs are identical. Which of the following is the correct ranking of the brightness of the bulbs

A$)$ B and C have equal brightness, and A is the dimmest.

B$)$ A and B have equal brightness, and C is the dimmest.

C$)$ A is brightest, C is dimmest, and B is in between.

D$)$ A is the brightest, and B and C have equal brightness but less than A $.$

E$)$ All three bulbs have the same brightness.

$19.-5$ points. For the circuit shown in the figure, the switch S isinitially open and the capacitor voltage is $80$ V $.$ The switch isthen closed at time $\backslash ($ t$=0\backslash ).$ What is the charge on the capacitor when the current in the circuit is $\backslash (33\backslash$mu A $\backslash )?$

Show your work.

A$)\backslash (1100\backslash$mu $\backslash$mathrm$\{$C$\}\backslash )$

B$)\backslash (1000\backslash$mu $\backslash$mathrm$\{$C$\}\backslash )$

C$)\backslash (960\backslash$mu $\backslash$mathrm$\{$C$\}\backslash )$

D$)890$ uC

E$)830$ uC

$20.-\backslash (\backslash$mathbf$\{10\}\backslash )$ points For the circuit shown in the figure, what is the current through resistor R$3?$ Show your work.

A$)0\mathrm{.}043$ A

B$)1\mathrm{.}5$ A

C$)0\mathrm{.}028$ A

D$)0\mathrm{.}086$