PHYSICS

JAMB 2022 - Question 23

Physics 2022 JAMB Past Questions - Question 23: If the stress on a wire is 10NM-² and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young’s modulus of the wire is

Choose the correct answers from the options given.
If the stress on a wire is 10NM-² and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young’s modulus of the wire is
A:
B:
C:
D:
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Correct Answer

D

Explanation

The Young's modulus (Y) of a material can be calculated using the formula:

Y = (stress / strain)

Where stress is the force applied per unit area (in this case 10â�· N/m²) and strain is the change in length relative to the original length (in this case (10.05 cm - 10.00 cm) / 10.00 cm = 0.005 / 10.00 = 0.0005).

So, Y = 10â�· N/m² / 0.0005 = 2 x 10¹¹ N/m².

Therefore, the Young's modulus of the wire is 2 x 10¹¹ N/m².