Current Electricity Charging Discharging Of Capacitors Question 328
Question: The resistance of a wire is 20 ohms. It is so stretched that the length becomes three times, then the new resistance of the wire will be
[MP PET 1989]
Options:
A) 6.67 ohms
B) 60.0 ohms
C) 120 ohms
D) 180.0 ohms
Show Answer
Answer:
Correct Answer: D
Solution:
In case of stretching of wire $ R\propto l^{2} $
$ \Rightarrow $ If length becomes 3 times so Resistance becomes 9 times i.e. $ R’=9\times 20=180\Omega $
BETA
