Question

Two metallic wires A and B are made of the same material. Wire A has length 1 and radius r while wire B has length 21 and radius 2r. The ratio of the resistance of wire A to that of wire B is:

• A. 2:1
• B. 4:1
• C. 1:4
• D. 1:2

Answer 1

Answer:

A. 2:1

2:1