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Q.

Iron and silicon wires are heated from 30°C to 50°C. The correct statement is that

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a

Resistance of both wires increases

b

Resistance of both wires decreases

c

Resistance of iron wire increases and that of silicon wire decreases

d

Resistance of iron wire decreases and that of silicon wire increases

answer is C.

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Detailed Solution

Temperature coefficient of resistance of metals is positive while that of semiconductor is negative.
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Iron and silicon wires are heated from 30°C to 50°C. The correct statement is that