Question

In steel, the Young's modulus and the strain at the breaking point are $2 \times 10^{11} N / m ^{2}$ and $0.15$ respectively. The stress at the breaking point for steel is therefore

• A. $1.33 \times 10^{11} N / m ^{2}$
• B. $1.33 \times 10^{12} N / m ^{2}$
• C. $7.5 \times 10^{-13} N / m ^{2}$
• D. $3 \times 10^{10} N / m ^{2}$

Answer 1

Answer: (D)

Breaking stress = strain $\times$ Young's modulus
$=0.15 \times 2 \times 10^{11}$
$=3 \times 10^{10} N / m ^{2}$