Piece of Aluminium and Silicon both are heated from $-10^{\circ} {C}$ to $40^{\circ} {C}$. The resistivity of

$Al$ decreases and ${Si}$ increases

Both ${Al}$ and ${Si}$ increase

JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Understanding +4 | -1

Piece of Aluminium and Silicon both are heated from

-10^{\circ} {C}

40^{\circ} {C}

. The resistivity of

View answer and explanation

Correct option: A

Al

increases and

Si

decreases

Option A (

Al

increases and

Si

decreases) is correct because the resistivity of conductors increases with temperature, while the resistivity of semiconductors decreases.

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\mathrm{\rho }

3\,\,{\mathrm{m}^3}

3\,\,\mathrm{\Omega }

4.7\,\, \times \,\,{10^6}\,\,\mathrm{\Omega }\,\, \pm \,\,5\,\,\%

22.5\,cm