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 bei

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 $3 m Ω$ . Arm $BC$ is cooled at a constant rate of $2 ° C s^{- 1}$ . If the galvanometer $G$ shows no deflection after $10 s,$ then $α$ is:

TestHub · Accepted Answer

For no deflection(balanced condition) 0 . 8 1 = R 3 ⇒ R = 2 . 4 m Ω Temperature fall in 10 s = 20 ° C Δ R = R αΔt ⇒ α = Δ R R Δt = 2 . 4 - 3 3 × 20 = - 1 × 10 - 2 ° C - 1

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