A copper wire was subjected to a tensile stress of 7.7 x 107 x 10 Nm-2. calculate strain of the wire. [young modules = 1.1 x 1011 Nm-2]

Assessment: JAMB UTME - Physics - 2011 Subject: Physics

Question 1 Report

A copper wire was subjected to a tensile stress of 7.7 x 107 x 10 Nm-2. calculate strain of the wire.
[young modules = 1.1 x 1011 Nm-2]

2. 0 x 10-5

7.0 x 10-3

7.0 x 10-4

2.2 x 10-4

Answer Details

Young modules = $\frac{Tensile stress}{Tensile strain}$

= $1.1 \times 10^{1} 1 = \frac{7.7 \times 10^{7}}{Tensile Strain}$

∴ Tensile strain = $\frac{7.7 \times 10^{7}}{1.1 \times 10^{1} 1}$

= $7.0 \times 10^{7 - 11} = 7.0 \times 10^{- 4}$

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