Current Electricity Charging Discharging Of Capacitors Question 374
Question: If the resistance of a conductor is 5 W at 50oC and 7 W at 100oC then the mean temperature coefficient of resistance of the material is
[Pb PET 2000]
Options:
A) $ 0.008{{/}^{o}}C $
B) $ 0.006{{/}^{o}}C $
C) $ 0.004{{/}^{o}}C $
D) $ 0.001{{/}^{o}}C $
Show Answer
Answer:
Correct Answer: A
Solution:
Using $ {R _{T _{2}}}={R _{T _{1}}}[1+\alpha (T _{2}-T _{1})] $
Therefore $ R _{100}=R _{50}[1+\alpha (100-50)] $
Therefore $ 7=5,[1+(\alpha \times 50)] $
Therefore $ \propto ,=,\frac{(7-5)}{250}=0.008{{/}^{o}}C $
BETA
