Question

Two wires A and B of circular cross-section are made of the same metal and have equal lengths, but the
resistance of wire A is four times greater than that of wire B. Find the ratio of their cross-sectional areas.​

Answer 1

Answer:

1/4

Explanation:

R=l/A

in A

area of cross section = l/4R

In B

area of cross section =1/R

now

ratio = (1/4R)/(1/R)

ratio =1/4