Question

b) If the resistance of wire A is four times the resistance of wire B,
calculate
(i) the ratio of the cross sectional areas of the wires
(ii) the ratio of the radii of the wires​

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.