Question

the reading of voltmeter is 1.49 volt when it is connected across a cell of emf 1.5 volt and having internal resistance 4 ohm. what is the resistance of voltmeter

Answer 1

Answer:

3.97 ohm

Explanation:

We are given that

Voltmeter reading=1.49 v

Emf,E=1.5 v

Internal resistance, r=4 ohm

We have to find the resistance of voltmeter

Current=$\frac{Emf}{r}=\frac{1.5}{4}=0.375 A$

$V=IR$

$R=\frac{V}{I}=\frac{1.49}{0.375}=3.97 ohm$

Hence, the resistance of voltmeter=3.97 ohm