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Q.

Which of the following graph shows variation of Resistivity of copper, nicrome and semiconductor with temperature respectively are 
 

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a

A, B,C

b

C,A,B

c

C,A,D

d

B,A,C

answer is B.

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Detailed Solution

Resistance of copper increases exponentially with temperature but incase of nichrome it is linear. 

for semiconductors, resistance decreases with temperature due to jumping of electrons from valency bond to conduction band when heated.

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