Question

A and B are two wires. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is:

• A. equal to that on A
• B. four times that on A
• C. two times that on A
• D. half that on A

Hint:

Stress is inversely proportional to the cross-sectional area of the wire, which is proportional to the square of the radius.

Answer 1

The Correct Option is B

Stress is inversely proportional to the square of the radius. Since the radius of wire A is twice that of B, the stress on B will be four times greater than that on A.
Final Answer: \[ \boxed{\text{Four times that on A}} \]