Question

Two exactly similar wires o f steel $(y=20 \times 10^{11}\, dyne/cm^2)$ and copper $(y=12 \times 10^{11}\, dyne/cm^2)$are stretched by equal forces. If the total elongation is 1cm, elongation of copper wire is

• A. 3/5 cm
• B. 5/3 cm
• C. 3/8 cm
• D. 5/8 cm

Answer 1

Answer: (D)

5/8 cm

Answer 2

$e_c = \frac{Y_s e}{Y_s + Y_c}$ e = Total elongation