JEE Main · 2004 · 24 Apr 2004 · Offline · Current Electricity

The thermistors are usually made of

(A)metals with low temperature coefficient of resistivity
(B)metals with high temperature coefficient of resistivity
(C)metal oxides with high temperature coefficient of resistivity✓ Correct
(D)semiconducting materials having low temperature coefficient of resistivity.

Answer: (C)

Solution

Thermistors are built so that their resistance changes sharply with temperature, meaning they have a high temperature coefficient of resistivity, and they are made from semiconducting metal oxides rather than from pure metals. So they are usually made of metal oxides with a high temperature coefficient of resistivity.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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