A copper rod of 88 c m and an aluminum rod of unknown length have their increase in length independent of…

A copper rod of 88 cm and an aluminum 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 
  1. 6.8 cm
  2. 113.9 cm
  3. 88 cm
  4. 68 cm

Solution

Increase in length is independent of temperature,
Lcu αcu=LAl αAl
LAl=88 cm1.7×10-52.2×10-5
=68 cm /

Asked in: NEET 2019 (All India)

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