Current Electricity Charging Discharging Of Capacitors Question 81
Question: A copper voltameter is connected in series with a heater coil of resistance $ 0.1,\Omega $ . A steady current flows in the circuit for twenty minutes and mass of 0.99 g of copper is deposited at the cathode. If electrochemical equivalent of copper is 0.00033 gm/C, then heat generated in the coil is
[Pb. PET 2002]
Options:
A) 750 J
B) 650 J
C) 350 J
D) 250 J
Show Answer
Answer:
Correct Answer: A
Solution:
m = Z i t
Therefore $ i=\frac{m}{Zt}=\frac{0.99}{0.00033\times 1200}=2.5A $ Hence heat generated in the coil is $ H=i^{2}Rt={{(2.5)}^{2}}\times 0.1\times 1200 $ = 750 J
BETA
