A steady current is flowing through the conductor of variable cross section as shown in the figure. Then select the correct option. 

In a current carrying conductor, 

$\rho =\text{Resistivity =}\frac{E}{J}\Rightarrow E=\rho .J=\rho \frac{i}{A}$

Since current i is same at all sections and resistivity is constant, $E_1<E_2$.

Also, $V_d=\frac{j}{ne}=\frac{i}{neA}\Rightarrow {\left(v_d\right)}_1<{\left(v_d\right)}_2$

Again, potential drop $=i.R$. Effective resistance between 1 and 2 is less than that between A and B