JEE Main 2019 — Physics solution

JEE Main2019Physics

A steel wire having a radius of 2.0 mm, carrying a load of 4 kg, is hanging from a ceiling. Given that g = 3.1 $π$ ms^–2, what will be the tensile stress that would be developed in the wire?

A
4.8 × 10⁶ Nm^–2
B
3.1 × 10⁶ Nm^–2
C
5.2 × 10⁶ Nm^–2
D
6.2 × 10⁶ Nm^–2

Solution

Stress = $\frac{F}{A} = \frac{4 \times 3.1 π}{π \times ( 2 \times 10 ^{- 3} ) ^{2}} = 3.1 \times 1 0^{6} N / m^{2}$

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