Current Electricity Charging Discharging Of Capacitors Question 687
The resistance of a wire is R. It is bent at the middle by $ 180{}^\circ $ and both the ends are twisted together to make a shorter wire. The resistance of the new wire is one-third of the original resistance?
Options:
2R
R/2
R/4
R/8
Show Answer
Answer:
Correct Answer: C
Solution:
Resistance of wire (R) $ =\rho \frac{l}{A} $ If wire is bent in the middle then $ l’=\frac{l}{2},A’=A $
BETA
