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 of resistance $50 \mathrm{\Omega }$ giving full scale deflection for a current of $10$ milliampere is to be changed into a voltmeter of range $100 \mathrm{V}$.

A resistance of _____ $\mathrm{\Omega }$ has to be connected in series with the galvanometer.

A student uses the resistance of a known resistor ($1 \Omega$ ) to calibrate a voltmeter and an ammeter using the circuits shown below. The student measures the ratio of the voltage to current to be $1\times {10}^3\Omega$ in circuit
(a) and $0.999\Omega$ in circuit (b). From these measurements, the resistance (in $\Omega$ ) of the voltmeter and ammeter are found to be close to

How  can a moving coil galvanometer be converted into a voltmeter?

Explain how a moving coil galvanometer can be converted into

$\left(\mathrm{ii}\right)$ a voltmeter of a given range.