Question:

To measure the temperature coefficient of resistivity α of a semiconductor, an electrical arrangement shown in the figure is prepared.The arm BC is
made up of the semiconductor. The experiment is being conducted at 25°C and resistance of the semiconductor arm is 3 mΩ. Arm BC is cooled at a constant rate of 2°C/s. If the galvanometer G shows no deflection after 10s, then α  is :

                                            JEE-2024         

Solution:                

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