Two conductors have the same resistance at 0ºC but their temperature coefficients of resistance are α 1 and α 2 . The respective temperature coefficients of their series and parallel combinations are nearly
A
, α 1 + α 2
B
α 1 + α 2 , 
C
α 1 + α 2 , 
D
, 
Text Solution
Verified by ExpertsThe correct answer is:
D
Let 
be the initial resistance of both conductors
∴ At temperature q their resistance will be,
and 
for, series combination, 
where 
or 
for parallel combination, 
where, 
as 
and 
are small quantities
is negligible
or 
as 
is negligible
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