A meter rod made of steel is correct at 0oC and other meter rod of same matrical is correct at 30oC- If -12 - 10-6-oC- the difference between their lengths at 20oC is

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A meter rod m...

Question

A meter rod made of steel is correct at $0^{o} C$ and other meter rod of same matrical is correct at $30^{o} C$ . If $α = 12 \times 10^{- 6} /^{o} C$ , the difference between their lengths at $20^{o} C$ is

0.024 c m

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0.012 c m

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0.036 c m

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0.048 c m

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(α = 12 \times 10^{- 6} /^{o} C)

(α = 18 \times 10^{- 6} /^{o} C)

0^{o} C

40^{o} C

5 m

0^{o} C

11 \times 10^{- 6 /^{o} C}

19 \times 10^{- 6 /^{o} C}

30^{\circ} C

0^{\circ} C

α

12 \times 10^{- 6} /^{\circ} C

α

19 \times 10^{- 6} /^{\circ} C

0^{\circ} C

- 20^{o} C

150 m m^{2}

- 20^{o} C

5000 N

α = 11.7 \times 10^{- 6} /^{o} C

Y = 2000 \times 10^{11} N / m^{2}

0^{o} C

(α_{b r a s s} = 12 \times 10^{- 6}^{o} C^{- 1}, α_{s t e e l} = 17 \times 10^{- 6}^{o} C^{- 1})

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