Current Electricity Charging Discharging Of Capacitors Question 553
Question: If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
[Pb. PET 2001]
Options:
A) 9 : 4
B) 4 : 3
C) 3 : 8
D) 3 : 2
Show Answer
Answer:
Correct Answer: D
Solution:
$ P _{Rated}\propto \frac{1}{R} $
Therefore $ \frac{R _{1}}{R _{2}}=\frac{P _{2}}{P _{1}}=\frac{60}{40}=\frac{3}{2} $
BETA
