Question

in the given circuit resistance of voltmeter is 400 ohm and its reading is 20 volts find the value of emf of battery
options
(1)_130/3 volts
(2)_65 v
(3)_40v
(4)_33.6v​

Answer 1

Answer:

complete the question please

Answer 2

Answer:

emf of battery = 40 volt

Explanation:

Given that:

Resistance of voltmeter(R) = 400 ohm

Rading of voltmeter(V) = 20 volt

Current passing through the voltmeter = I A

$i = \frac{v}{r} \: ampere \\ i = \frac{20}{400} ampere \\ i = 0.05 \: amper$

So the current in the circuit (I) = 0.05 A

We know e.m.f of cell;

E = V+ IR

So;

E = 20 + (0.05 × 400) volt

or, E = 40 volt

So, emf of cell = 40 volt

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