Current Electricity Charging Discharging Of Capacitors Question 323
Question: If a 0.1 % increase in length due to stretching, the percentage increase in its resistance will be
[MNR 1990; MP PMT 1996; UPSEAT 1999; MP PMT 2000]
Options:
A) 0.2 %
B) 2 %
C) 1 %
D) 0.1 %
Show Answer
Answer:
Correct Answer: A
Solution:
$ R\propto l^{2} $
$ \Rightarrow $ $ \frac{\Delta R}{R}=\frac{2\Delta l}{l} $
$ \Rightarrow $ $ \frac{\Delta R _{0}}{R}%=2\times 0.1=0.2% $
BETA
