qu.1.topic=<strong>Ch 19, 21</strong>, <font size="-1"><b>Sec 1</b></font> - Electric Charge@

qu.1.1.mode=Randomized Formula@
qu.1.1.editing=useHTML@
qu.1.1.name=Water Molecules@
qu.1.1.question=How much $negative electric charge is contained in $n molecules of water?@
qu.1.1.answer=$ans C (1 ? 0.05)@
qu.1.1.random=
		$integer\=rint(2);
		$negative\=switch($integer,"negative","positive");
		$n\=int(rint(500)+2);
		$k\=switch($integer,-1,1);
		$e\=1.6*10^(-19);
		$H2O\=10;
		$ans\=sig(3,$n*$k*$e*$H2O)@

qu.2.topic=<strong>Ch 19, 21</strong>, <font size="-1"><b>Sec 2</b></font> - Coulomb’s Law@

qu.2.1.mode=Randomized Formula@
qu.2.1.editing=useHTML@
qu.2.1.name=Three Charges@
qu.2.1.question=Knowing that <i>d</i> = $d m, <i>l</i> = $l m, <i>Q</i> = $large_Q C, and <i>q</i> = $q C, find the magnitude of the force exerted on the charge <i>q</i>.
<p align=center>
<img src="http://physics.unl.edu/directory/lee/edu/physics/graphics/ch19,21/sec2/qu1-1.gif">
</p>@
qu.2.1.answer=$ans N (1 ? 0.05)@
qu.2.1.random=
		$k_distance\=rand(1.2,3);
		$k_charge\=rand(2.5,6);
		$l\=rand(2,7,3);		
		$d\=sig(3,$l*$k_distance);
		$q\=rand(0.01,0.12,3);
		$large_Q\=sig(3,$q*$k_charge);
		$m\=($d^2-($l/2)^2)^(1/2);
		$ans\=sig(3,2*8.99*10^9*$large_Q*$q/$d^2*$m/$d)@

qu.3.topic=<strong>Ch 19, 21</strong>, <font size="-1"><b>Sec 3</b></font> - Electric Current@

qu.3.1.mode=Randomized formula@
qu.3.1.editing=useHTML@
qu.3.1.name=# of Charges@
qu.3.1.question=How many charges flow through a cross section of a wire in $t s if the current is $I A?@
qu.3.1.answer=$ans (1 ? 0.05)@
qu.3.1.random=
		$t\=rand(1,12,3);
		$I\=rand(2,20,3);
		$ans\=sig(3,$I*$t/(1.6*10^(-19)))@

qu.4.topic=<strong>Ch 19, 21</strong>, <font size="-1"><b>Sec 4</b></font> - Electric Current@

qu.4.1.mode=Randomized Formula@
qu.4.1.editing=useHTML@
qu.4.1.name=Resistivity@
qu.4.1.question=Find the resistivity of a wire that is $l m long and is $rad mm in radius if under a potential difference of $V V it conducts $I A of current.  Give the answer in <i>Ohm-m</i>.@
qu.4.1.answer=$ans Ohm-m (1 ? 0.05)@
qu.4.1.random=
		$l\=rand(7,12,3);
		$rad\=rand(2,5,3);
		$V\=rand(10,35,3);
		$I\=rand(0.5,7,3);
		$A\=3.14*($rad/1000)^2;
		$l\=rand(7,18,3);
		$R\=$V/$I;
		$ans\=sig(3,$R*$A/$l)@

qu.5.topic=<strong>Ch 19, 21</strong>, <font size="-1"><b>Sec 5</b></font> - Energy and Power in Electric Circuits@

qu.5.1.mode=randomized formula@
qu.5.1.editing=useHTML@
qu.5.1.name=Light Bulb - Power@
qu.5.1.question=Find the power dissipated by a $R-<font face=symbol>W</font> light bulb if it operates with a current of $I A.@
qu.5.1.answer=$ans W (1 ? 0.05)@
qu.5.1.random=
		$R\=rand(5,25,3);
		$I\=rand(0.5,7,3);
		$ans\=sig(3,$I^2*$R)@

qu.6.topic=<strong>Ch 19, 21</strong>, <font size="-1"><b>Sec 6</b></font> - Resistors in Series and Parallel@

qu.6.1.mode=Randomized Formula@
qu.6.1.editing=useHTML@
qu.6.1.name=System of Resistors@
qu.6.1.question=Find the equivalent resistance between points <b>A</b> and <b>B</b> for the system of resistors shown below if <i>R</i><sub>1</sub> = $R1 <font face=symbol>W</font>, <i>R</i><sub>2</sub> = $R2 <font face=symbol>W</font>, and <i>R</i><sub>3</sub> = $R3 <font face=symbol>W</font>.  Give the answer in <i>Ohms</i>.
<p align=center>
<img src="http://physics.unl.edu/directory/lee/edu/physics/graphics/ch19,21/sec6/qu1-1.gif">
</p>@
qu.6.1.answer=$ans Ohms (1 ? 0.05)@
qu.6.1.random=
		$R1\=rand(1,5,3);
		$R2\=rand(7,15,3);
		$R3\=rand(10,20,3);
		$ans\=sig(3,$R1+9*$R2*$R3/(3*$R2+3*$R3))@

qu.7.topic=<strong>Ch 19, 21</strong>, <font size="-1"><b>Sec 7</b></font> - Kirchhoff’s Rules@

qu.7.1.mode=Randomized Formula@
qu.7.1.editing=useHTML@
qu.7.1.name=2 EMFs, 3 Resistors@
qu.7.1.question=Use Kirchhoff’s rules to find the magnitude of current through resistor <i>R</i><sub>$R</sub> if <i>R</i><sub>1</sub> = $R1 <font face=symbol>W</font>, <i>R</i><sub>2</sub> = $R2 <font face=symbol>W</font>, <i>R</i><sub>3</sub> = $R3 <font face=symbol>W</font>, <font face=symbol>e</font><sub>1</sub> = $E1 V, and <font face=symbol>e</font><sub>2</sub> = $E2 V.
<p align=center>
<img src="http://physics.unl.edu/directory/lee/edu/physics/graphics/ch19,21/sec7/qu1-1.gif">
</p>@
qu.7.1.answer=$ans A (1 ? 0.05)@
qu.7.1.random=
		$integer\=rint(3);
		$R\=switch($integer,"1","2","3");
		$R1\=rand(4,10,3);
		$R2\=rand(5,7,3);
		$R3\=rand(3,20,3);
		$E1\=rand(5,15,3);
		$E2\=rand(1,8,3);
		$ans2\=switch($integer,$E1/($R1+$R2),$E1/($R1+$R2),($E1+$E2)/$R3);
		$ans\=sig(3,abs($ans2))@