A steel rod at 25 °C is observed to be 1 m long when measured by another metal scale which is correct at 0 °C. The exact length of the steel rod at 0°C is
(αsteel = 12 × 10-6/°C, αmetal = 20 × 10-6/°C)
1
1.00002 m
2
1.0002 m
3
0.998 m
4
0.9998 m
A steel rod at 25 °C is observed to be 1 m long when measured by another metal scale which is correct at 0 °C. The exact length of the steel rod at 0°C is
(αsteel = 12 × 10-6/°C, αmetal = 20 × 10-6/°C)