Voltmeter

The reading on a high resistance voltmeter, when a cell is connected across it, is 2.5 V. When the terminals of the cell are also connected to resistance of  $5 \mathrm{\Omega }$  as shown in the circuit, the voltmeter reading drops to 2.0 V. The internal resistance of the cell is:

A cell of emf $90 \mathrm{V}$ is connected across series combination of two resistors each of $100 \mathrm{\Omega }$ resistance. A voltmeter of resistance $400 \mathrm{\Omega }$ is used to measure the potential difference across each resistor. The reading of the voltmeter will be:

Two identical cells each of emf $1.5 \mathrm{V}$ are connected in series across a $10 \mathrm{\Omega }$ resistance. An ideal voltmeter connected across $10 \mathrm{\Omega }$ resistance reads $1.5 \mathrm{V}$. The internal resistance of each cell is _____ $\mathrm{\Omega }$.

As shown in the figure the voltmeter reads $2 \mathrm{V}$ across $5 \mathrm{\Omega }$ resistor. The resistance of the voltmeter is _____ $\mathrm{\Omega }$

A student is provided with a variable voltage source $V$, a test resistor $R_T=10\Omega$, two identical galvanometers $G_1$ and $G_2$ and two additional resistors, $R_1=10M\Omega$ and $R_2=0.001\Omega$. For conducting an experiment to verify ohm's law, the most suitable circuit is:

A cell of emf $90 \mathrm{V}$ is connected across series combination of two resistors each of $100 \mathrm{\Omega }$ resistance. A voltmeter of resistance $400 \mathrm{\Omega }$ is used to measure the potential difference across each resistor. The reading of the voltmeter will be:

Why is voltmeter always connected in parallel circuits?

In a moving coil galvanometer, when the number of turns of the coil is doubled,

In the given electrical circuit the reading of voltmeter is

Two resistors are connected in series across a battery as shown in figure. If a voltmeter of resistance $2000 \mathrm{\Omega }$  is used to measure the potential difference across $500 \mathrm{\Omega }$ resistor, the reading of the voltmeter will be _____ $\mathrm{V}$

The current sensitivity of a moving coil galvanometer increases by $20\%$ when its resistance is doubled. Calculate, by what factor does the voltage sensitivity change?

Two resistances $500\mathrm{ohm}$ and $1000\mathrm{ohms}$ are connected in series with a battery of $1.5$ volt. The voltage across the $1000\mathrm{ohms}$ resistance is measured using a voltmeter having a resistance of $1000\mathrm{ohm}$. Find the reading in the voltmeter.

A resistance $R$ of $100\Omega$ is to be measured by using an ammeter and voltmeter in standard methodology. If the readings of ammeter and voltmeter are $12 \mathrm{mA}$ and $1 \mathrm{V}$ respectively. Which of the following conclusion is correct

A voltmeter of resistance $R_v$ and ammeter of resistance $R_A$ are connected in series across a battery of emf $E$ and of negligible internal resistance. When a resistance $R$ is connected in parallel to voltmeter, reading of ammeter increases to three times while that of voltmeter reduces to one-third
Choose the correct statements

For the circuit is shown below.

A galvanometer gives full scale deflection with $8 \mathrm{mA}$ current. By connecting a resistor of value $2230 \mathrm{\Omega }$ in series it can be converted into a voltmeter of range $0-18 \mathrm{V}$. If the galvanometer is connected to $R=\frac{10}{n}\mathrm{\Omega }$ in parallel it becomes ammeter of range $0-2 \mathrm{A}$, the value of $n$ is

A Galvanometer has a resistance of $200 \mathrm{\Omega }$. A current of $1 \mathrm{mA}$ gives full scale deflection. The resistance which should be connected with Galvanometer to convert it into an voltmeter reading upto $5 \mathrm{V}$. 

What will happen if a high resistor is connected in parallel with the galvanometer while converting it into a voltmeter?

Why a high-value resistor is used in series with a galvanometer in order to convert it into a voltmeter?

To convert a galvanometer into a _____ a high resistance must be connected in series with it.