Question

A steel wire is 1 m long and 1mm$^2$ in area of cross-section. If it takes 200 N to stretch this wire by I mm how much force will be required to stretch the wire of the same area and of same material having length of 10m to 1002 cm

• A. 100 N
• B. 200 N
• C. 400 N
• D. 2000 N

Answer 1

Answer: (C)

400 N

Answer 2

$e \alpha \frac{1}{r^4}$