CUET and UG exam CUET UG 2025 Mock Test Series Electrician and Wireman Electrical Networks Resistors
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 :
1
– 2 × 10–2 °C–1
2
– 1.5 × 10–2 °C–1
3
– 1 × 10–2 °C–1
4
– 2.5 × 10–2 °C–1