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PHYSICS

JAMB 2020 - Question 14

Physics 2020 JAMB Past Questions - Question 14: If the stress on a wire is 10· Nm² and the wire is stretched from its original length of 10.00 cm to 10.05cm.The young’s modulus of the wire is

Choose the correct answers from the options given.

If the stress on a wire is 10· Nm² and the wire is stretched from its original length of 10.00 cm to 10.05cm.The young’s modulus of the wire is

A: 5.0x10Nm²

B: 5.0 x 10Nm¯²

C: 2.0 X 10Nm¯²

D: 2.0 X 10¹Nm¯²

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Correct Answer

Explanation

Y = stress/strain, but stress = 107Nm-2 (given).

Strain = e/l0. = (10.05 - 10.00)/10.00 = 0.005

Thus Y = 107/0.005 = 2 . 0 x 109Nm-2