The positive temperature coefficient of resistance is for
A
Carbon
B
Germanium
C
Copper
D
An electrolyte
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C
Copper
c (c) For metallic conductors, temperature co-efficient of resistance is positive.
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The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be..... $\%$.
In the adjoining circuit, the $e.m.f.$ of the cell is $2\, volt$ and the internal resistance is negligible. The resistance of the voltmeter is $80 \,ohm$. The reading of the voltmeter will be ............. $volt$