Current Electricity Charging Discharging Of Capacitors Question 557
Question: If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,
[BCECE 2004]
Options:
A) 2 : 1
B) 1 : 2
C) 2 : 9
D) 9 : 2
Show Answer
Answer:
Correct Answer: C
Solution:
Heat $ H=\frac{V^{2}t}{R} $
Therefore $ H\propto \frac{1}{R} $ (If V, t constant)
Therefore $ \frac{H _{S}}{H _{P}}=\frac{R _{P}}{R _{S}}=\frac{( \frac{R\times 2R}{3R} )}{(R+2R)}=\frac{2}{9} $
BETA
