Question

Ratio of 2 wires of same material is 1:2 and ratio of their cross sectional area is 4:1 . Calculate the ratio of heat produced in the 2 wires if same potential difference is applied at same time ?​

Answer 1

solution:

H=V2t/R=V2At/ρl. So H∝A,

therefore H1/H2=A1/A2=1/4