A steel wire having a radius |CurrentElectricityJEEMain2019

JEE MAIN 2019

08-04-2019 S1

Question

A steel wire having a radius of 2.0 mm , carrying a load of 4 kg , is hanging from a ceiling. Given that g $=3.1 \pi \mathrm{~ms}-2$, what will be the tensile stress that would be developed in the wire?

Select the correct option:

$4.8 \times 10^6 \mathrm{Nm}^{-2}$

$3.1 \times 10^6 \mathrm{Nm}^{-2}$

$5.2 \times 10^6 \mathrm{Nm}^{-2}$

$6.2 \times 10^6 \mathrm{Nm}^{-2}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

Stress $=\frac{F}{A}=\frac{4 \times 3.1 \pi}{\pi \times\left(2 \times 10^{-3}\right)^2}=3.1 \times 10^6 \mathrm{~N} / \mathrm{m}^2$

Question Tags

JEE Main

Physics

Easy

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