Question

Silver and copper voltmeters are connected in parallel with a battery of emf `12V`. In `30` minutes, `1g` of silver and `1.8g` of copper are liberated. The power supplied by the battery is
`(Z_(Cu) = 6.6xx10^(-4) g//C and Z_(Ag) = 11.2xx10^(-4)g//C`)
A. `24.13 J//sec`
B. `2.413 J//sec`
C. `0.2416 J//sec`
D. `2413 J//sec`

Answer 1

Correct Answer - A
Current (silver voltmeter)
`i_(1) = (m)/(Zt) = (1)/(11.2xx10^(-4)xx30xx60) = 0.496A`
Copper voltmeter
`i_(2) = (1.8)/(6.6xx10^(-4)xx30xx60) = 1.515A`
`I = i_(1) +i_(2) = 2.011 A`
`P = Vi = 12 xx 2.011 = 24.132 J//sec`.