Current Electricity Charging Discharging Of Capacitors Question 368
Question: The resistance of a wire is R. If the length of the wire is doubled by stretching, then the new resistance will be
[Roorkee 1992; AFMC 1995; KCET 1993; AMU (Med.) 1999; CBSE PMT 1999; MP PET 2001; UPSEAT 2001]
Options:
A) 2R
B) 4R
C) R
D) $ \frac{R}{4} $
Show Answer
Answer:
Correct Answer: B
Solution:
$ R\propto l^{2} $
Therefore If l doubled then R becomes 4 times.
BETA
