Question

On applying a stress of $20 \times 10^{8}N/m^{2}$ the length of a perfectly elastic wire is doubled. Its Young’s modulus will be

• A. $40 \times 10^{8}N/m^{2}$
• B. $20 \times 10^{8}N/m^{2}$
• C. $10 \times 10^{8}N/m^{2}$
• D. $5 \times 10^{8}N/m^{2}$

Answer 1

Answer: (B)

$20 \times 10^{8}N/m^{2}$

Answer 2

When strain is unity then Young's modulus is equal to stress.