Current Electricity Charging Discharging Of Capacitors Question 433
Question: Two wires that are made up of two different materials whose specific resistance are in the ratio 2 : 3, length 3 : 4 and area 4 : 5. The ratio of their resistances is
[Kerala PMT 2005]
Options:
A) 6 : 5
B) 6 : 8
C) 5 : 8
D) 1 : 2
Show Answer
Answer:
Correct Answer: C
Solution:
Resistance $ =\rho \frac{l}{A} $
$ \
Therefore $ $ \frac{R _{1}}{R _{2}}=\frac{{\rho _{1}}}{{\rho _{2}}}\times \frac{l _{1}}{l _{2}}\times \frac{A _{2}}{A _{1}}=\frac{2}{3}\times \frac{3}{4}\times \frac{5}{4}=\frac{5}{8} $
BETA
