Assertion: The resistance of an ideal voltmeter should be infinite.

Reason: The lower resistance of the voltmeter gives a reading lower than the actual potential difference across its terminals.

A moving coil galvanometer of resistance $40 \Omega$ gives full scale deflection when a current of $0.25 \mathrm{mA}$ is passed through it. To convert it to voltmeter of range $10 \mathrm{V}$, the resistance required to be placed in series is

A galvanometer can withstand safely a maximum current of $5 \mathrm{mA}$. It is converted into a voltmeter reading upto $20 \mathrm{V}$ by connecting in series, an external resistance of $3.96 \mathrm{k} \Omega$ The resistance of the galvanometer is

A galvanometer gives full scale deflection when the current passed through it is $3 \mathrm{mA}$. Its resistance is $100 \Omega$ without connecting additional resistance in series, then it can be used as voltmeter of range

A voltmeter of range $3 \mathrm{V}$ and resistance $200 \Omega$ cannot be converted to an ammeter of range

A galvanometer of resistance $50 \mathrm{\Omega }$ is connected to a battery of $3 \mathrm{V}$ along with a resistance of $2950 \mathrm{\Omega }$ in series. A full-scale deflection of $30$ divisions is obtained in the galvanometer. In order to reduce this deflection to $20$ divisions, the resistance in the series should be

A galvanometer may be converted into an ammeter or a voltmeter. In which of the following cases is the resistance of the device so obtained least?

Voltmeters $V_{1}$ and $V_{2}$ are connected in series across a D.C. line. $V_{1}$ reads 80 volt and has a per volt resistance of $200 \Omega$ and $V_{2}$ has a total resistance of $32 \mathrm{k\Omega }$. The line voltage is

What is the relation between voltage sensitivity $S_{\mathrm{v}}$ and the current sensitivity $S_{\mathrm{I}}$ of a moving coil galvanometer? (Given that $G$ is the resistance of the galvanometer)