Self-Inductance of a Solenoid

%% Self-Inductance of a Solenoid
% Determines the inductance and rate at which current must chagne through
% it to produce an EMF

% Constants
muNaught = (4*pi)*10^-7;                   %[T*m/A] Vacuum Permeability

% Inputs and Variables
r = input('What is the radius?\n');
N = input('How many turns?\n');
l = input('Length of the solenoid\n');
E = input('EMF produced\n');

% Outputs and Equations
A = pi*r*r;
L = muNaught*N*N*A/l;
rate = E/L;
fprintf('The inductance is %.3e and the rate is %.3e\n', L, rate)