text: ##DESCRIPTION
  ## insert description here
  ##ENDDESCRIPTION
  
  ## DBsubject(Electricity)
  ## DBchapter(Magnetism)
  ## DBsection(Force on a Moving Charge in a Magnetic Field: Examples and Applications)
  ## Date(12 January 2018)
  ## Institution(Brock University)
  ## Author(Kyle Winch)
  ## Edited (Sara Hesse, May 30 2018)
  ## TitleText('College Physics')
  ## AuthorText('Urone et al')
  ## EditionText('2017')
  ## Section('22.5')
  ## Problem('006')
  ## KEYWORDS('units','voltage','energy','magnetic','field','speed')
  
  
  DOCUMENT();
  loadMacros( "PGbasicmacros.pl",
                       "MathObjects.pl",
  	             "PGauxiliaryFunctions.pl",
  	             "PGchoicemacros.pl",
  	             "PGanswermacros.pl",
                       "PG_CAPAmacros.pl",
                       "BrockPhysicsMacros.pl",
                       "answerHints.pl"
  );
  
  TEXT(beginproblem());
  
  $showPartialCorrectAnswers = 1;
  $showHint =3;
  
  $T = random(0.095,0.105,0.001);
  $speed = random(3.95,4.05,0.01);
  $D = random(0.95,1.05,0.01);
  $E = ($speed*10**6)*$T;
  $F = ($E*($D*10**-2))*10**-3;
  
  BEGIN_TEXT
  <strong>If you don't solve this problem correctly in $showHint tries, you can get a hint.</strong>
  
  $PAR
  A velocity selector in a mass spectrometer uses a \($T \, \(\textrm{T}\) magnetic field.
  $PAR
  
  a) What electric field strength is needed to select a speed of \($speed\) \(\times 10^{6} \, \(\textrm{m/s}\)?
  $PAR
  
  \{ans_rule(40)\} \(\textrm{V/m}\)
  
  $PAR
  END_TEXT
  
  ANS(num_cmp("$E"));
  
  BEGIN_TEXT
  b) What is the voltage between the plates if they are separated by \($D \, \(\textrm{cm}\)?
  $PAR
  
  \{ans_rule(40)\} \(\textrm{kV}\)
  
  $PAR
  END_TEXT
  
  ANS(num_cmp("$F"));
  
  BEGIN_HINT
  Remember to make appropriate unit conversions. 
  END_HINT
  Context()->normalStrings;
  
  
  
  ENDDOCUMENT()
  