A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature.
A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature.
The length of aluminum rod is:
(αCu = 1.7 × 10-5 K-1 and αAl = 2.2 × 10-5 K-1)
(A) 88 cm
(B) 68 cm
(C) 6.8 cm
(D) 1 13.9 cm
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(B) 68 cm
LCu αCu ∆T = LAl αAl ∆T
∴ 88 × (1.7 × 10-5) = LAl(2.2 × 10-5)
∴ LAl = \(\frac{88\times1.7}{2.2}\)
∴ LAl = 68 cm
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