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 $2 5^{\circ} C$ and resistance of the semiconductor arm is $3 m Ω$ . Arm $BC$ is cooled at a constant rate of $2^{\circ} C s^{- 1}$ . If the galvanometer $G$ shows no deflection after $10 s,$ then $α$ is:

TestHub · Accepted Answer

For no deflection(balanced condition) 1 0.8 ​ = 3 R ​ ⇒ R = 2.4 m Ω Temperature fall in 10 s = 2 0 ∘ C Δ R = R α Δ t ⇒ α = R Δ t Δ R ​ = 3 × 20 2.4 − 3 ​ = − 1 × 1 0 − 2 ∘ C − 1

Physics - Current Electricity Question with Solution | TestHub

Options:

Doubts & Discussion