If the ratio of lengths, radii and Young's moduli of steel and brass wires shown in the figure are a,b and c respectively, the ratio between the increase in lengths of brass and steel wires would be :

Question

(1) $\large\frac{b^2a}{2c}$

(2) $\large\frac{bc}{2a^2}$

(3) $\large\frac{ba^2}{2c}$

(4) $\large\frac{b^2c}{2a}$