showing error like ??? Error using ==> rdivide Matrix dimensions must agree.

w1=4.7;    %workfunction of tungsten
E0=6.9;    %Breakdown field
l1=25;    %length of the elctrode
b1=25;    %breadth of electrode 
P1=1*10^18;
c=8.84*10^-19;
m1=19.3;
m2=2.65;
h=10;
l2=50;
b2=50;
A1=l1*b1;
A0=l2*b2;
E1=8.85*10^-21;
d=10:100:1000;
B1=(d./d0).^(1/3);
E2=E0.*(1./B1);
V=d.*E2;
U0=0.5.*E1.*E2.^2.*(d0./d).^(2/3);
A2=A1.*U0./P1;
U1= U0.*d.*A1./(d+h).*(A1+A0);
M1=m1.*h.*A1;
M2=m2.*h.*A2;
U2=U1./(M1+M2);
x1=E2.*E1;
X2=E1.*E2./(d+h);
C1=c.*d./((d+h).*(1+A0/A1));
R=d./x1.*A1;
C=c.*d.*A1;
T=R.*C;
P=U2./T;
plot(P,d)

[j_solar]

its difficult to understand your code.

But the problem is that the two vectors or matrices that your are trying to divide with "./" do not have the same size. check on that