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38. Two exactly similar wires of steel and copper are stretched by equal forces. If the total elongation is 2 cm, then how much is the elongation in steel and copper wire respectively? Given, Y. = 20 * 1011 dyne/cm2, Y = 12 x 10" dyne/cm2. (1) 125 cm, 0.75 cm bLED (2) 0.75 cm; 1.25 cm (3) 1.15 cm, 0.85 cm (4) 0.85 cm; 1.15 cm and a length of

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Q1

15, Two exactly similar wires of steel and copper are stretched by equal forces. If the total elongation is 2 cm, then how much is the elongation in steel and copper wire respectively? Given, Ysteel-20 x 1011 dyne/cm2, Y copper (1) 1.25 cm; 0.75 cm (2) 0.75 cm; 1.25 cm - 12 x 1011 dyne/cm2 2 (3) 1.15 cm, 0.85 cm (4) 0.85 cm; 1.15 cm

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Q2

Two exactly similar wires of steel and copper are stretched by equal forces. If the total elongation is 2cm, then how much is the elongation in steel and copper wire respectively? Given Y

_{s t e e l}

=20 x 10

^{11}

dyne/cm

^{2}

,

Y_{c o p p e r}

= 12 x 10

^{11}

dyne/cm

^{2}

.

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Q3

Two exactly similar wires of steel and copper are stretched by equal forces. If the difference in their elongation is 0.5 cm, then find elongation of copper wire.

[y_{s t} = 2 \times 10^{12} d y n e / c m^{- 2} & y_{c u} = 12 \times 10^{11} d y n e / c m^{2}]

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Q4

Two exactly similar wires of steel (y

=

20 x 10

^{11}

dyne/cm

^{2}

) and copper (y

=

12 x 10

^{11}

dyne/cm

^{2}

)are stretched by equal forces. If the total elongation is 1cm, elongation of copper wire is

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Q5

What force is required to stretch a copper wire

1 c m^{2}

in cross-section to double its length?

Y

for copper is

1.26 \times 10^{12} d y n e c m^{- 2}

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