Starter Motor

%% Starter Motor
% Determines the electric charge passing through a motor, the current
% density, and how far a charge travels while the motor is on.

% Inputs and Variables
I = input('Electric current from battery in Amps\n');
deltat = input('How long does the  motor run in seconds?\n');
d = input('What is the diameter of the wire in meters?\n');
n = input('What is the density of conduction for the wire?\n');
if n == 0
    disp('No given constant entered. Will not calculate distance traveled of a charge.');
else
    q = input('What is the charge traveling through the wire?\n');
end

% Outputs and Equations
Q = I * deltat;
A = pi*(d^2)/4;
j = I/A;
fprintf('The amount of electric charge passes through the starter motor is %e C \n',Q);
fprintf('The current density in the wire is %e A/m^2 \n', j);
if n == 0
    disp('Distance traveled of a charge will not be calculated.');
else
    deltax = (j*deltat)/(n*q);
    fprintf('The distance traveled of the charge is %e m \n', deltax);
end

%{
Notice that there is no set constant. A given constant for the density of
    conduction should be given to the user in the question.
A common material for a wire is copper which the density of conduction is 8.50*10^28
%}