Current Electricity Charging Discharging Of Capacitors Question 365
Question: A metal wire of specific resistance $ 64\times {{10}^{-6}}ohm-cm $ and length 198 cm has a resistance of 7 ohm, the radius of the wire will be
[MP PET 1994]
Options:
A) 2.4 cm
B) 0.24 cm
C) 0.024 cm
D) 24 cm
Show Answer
Answer:
Correct Answer: C
Solution:
$ R=\rho \frac{l}{A}\Rightarrow 7=\frac{64\times {{10}^{-6}}\times 198}{\frac{22}{7}\times r^{2}} $
Therefore $ r=0.024cm $
BETA
