Current Electricity Charging Discharging Of Capacitors Question 545
Question: $ A5^{o}C $ rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to
[BHU 2004]
Options:
A) $ 5^{o}C $
B) $ 10^{o}C $
C) $ 20^{o}C $
D) $ 40^{o}C $
Show Answer
Answer:
Correct Answer: C
Solution:
Using conservation of energy, supplied electric energy = absorbed heat energy
Therefore $ i^{2}Rt=VIt $
Therefore $ T\propto i^{2} $ (T - change in temperature) i.e. when i is doubled T will be four times i.e. $ 5\times 4=20^{o}C $
BETA
