Q. 23

# The potential dif

Answer :

Let the current through the circuit *i* be.

Emf of battery, *E* = 12 V

Voltage drop across the voltmeter, *V* = 10 V

Internal resistance of the battery, *r* = 2 Ω

Applying Kirchhoff’s Law, the algebraic sum of voltage and voltage drop in the circuit is zero,

we get

Where, E = battery emf

V=voltage drop

r=internal resistance

I = current through the circuit

Using the formula, from faraday’s law of electrolysis –

where,

m = the mass of the substance deposited on the electrode

z=electrochemical equivalence

i=current passing

t=time taken

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