A copper rod of 88cm and an aluminimum rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is: (alpha_(Cu) =1.7 xx 10^(-5) K^(-1) and alpha_(Al)= 2.2 xx 10^(-5) K^(-1))

A copper rod of 88cm and an aluminimum rod of unknown length have thei

1.	A copper rod of 88cm and an aluminimum rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is: (alpha_(Cu) =1.7 xx 10^(-5) K^(-1) and alpha_(Al)= 2.2 xx 10^(-5) K^(-1))
Answer» 68cm 6.8cm 113.9cm 88cm Solution :Here, `(Delta L)_(CU)= (Delta l)_(Al)` `l_(Cu) alpha_(Cu) Delta T= l_(Al) alpha_(Al) DELTAT` `l_(Al) = (l_(Cu)) (alpha_(Cu))/(alpha_(Al))= (88 XX 1.7 xx 10^(-5))/(2.2 xx 10^(-5))= 68cm`