For a metallic wire, the ratio (R = 
applied potential difference and i = current flowing) is
Text Solution
Verified by ExpertsThe correct answer is:
B
The resistance of metallic wire at temperature t ° C is given by
R t = R 0 (1 + αt)
Where α is coefficient of expansion.
Hence, resistance of wire increases on increasing the temperature. Also, from Ohm’s law, ratio of 
is equal to R ie,
= R
Hence, on increasing the temperature the ratio 
increases.
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