In an experiment to determine the temperature coefficient of resistance of a conductor, a coil of wire X is immersed in a liquid. It is heated by an external agent. A meter bridge set up is used to determine resistance of the coil X at different temperatures. The balancing points measured at temperatures t
1=0°C and t
2=100°C are 50 cm and 60 cm respectively. If the standard resistance taken out is S=4Ω in both trials, the temperature coefficient of the coil is
