Question

If the resistance of wire A is four times resistance of wire B then the ratio of cross

sectional areas of wires is

a) 1 : 2 b) 1 : 4 c) 1 : 8 d) 1 : 6​

Answer 1

The ratio of the cross sectional area and radius are 1:2 and 1:√2. So, The resistance of the wire is inversely proportional to the square of area of cross section. Hence, The ratio of the cross sectional area and radius are 1:2 and 1:√2.