Conversion of Galvanometer to Ammeter and Voltmeter

A current of $30 \mathrm{mA}$ is required in a galvanometer for full scale deflection. The galvanometer has the coil of resistance $30 \mathrm{\Omega }$. If a maximum current of $3 \mathrm{A}$ is to be passed through the galvanometer then the resistance that should be added as shunt is

A galvanometer with its coil resistance $\mathrm{25 }\mathrm{\Omega }$ requires a current of $1 \mathrm{mA}$ for its full deflection. In order to construct an ammeter to read up to a current of $2 \mathrm{A}$ the approximate value of the shunt resistance should be:

A $50\mathrm{ }\mathrm{\Omega }$ resistance is connected to a battery of $5 \mathrm{V}$. A galvanometer of resistance $100\mathrm{ }\mathrm{\Omega }$ is to be used as an ammeter to measure current through the resistance, for this a resistance $r_{\mathit{S}}$ is connected to the galvanometer. Which of the following connections should be employed if the measured current is within $1\%$ of the current without the ammeter in the circuit?

The ammeter has range of $1$ $\mathrm{A}$, without shunt. The range can be varied by using different shunt resistances. The graph between shunt resistance and range will have the nature as

A moving coil galvanometer of resistance $100 \mathrm{\Omega }$ is used as an ammeter using a resistance $0.1 \mathrm{\Omega }$. The maximum deflection current in the galvanometer is $100 \mathrm{\mu A}$. Find the minimum current in the circuit so that the ammeter shows maximum deflection.

A moving coil galvanometer of resistance $100 \mathrm{\Omega }$ is used as an ammeter using a resistance $0.1 \mathrm{\Omega }$. The maximum deflection current in the galvanometer is $100 \mathrm{\mu A}$. Find the minimum current in the circuit so that the ammeter shows maximum deflection.

A voltmeter has a $25 \mathrm{\Omega }$ coil and $575 \mathrm{\Omega }$ in series. The coil takes $10\mathrm{ }\mathrm{m}\mathrm{A}$ for full-scale deflection. The maximum potential difference which can be measured is -

In the given circuit, voltmeter reads $5 \mathrm{V}.$ The resistance of the voltmeter is:

What resistance should be connected in series of a galvanometer of resistance $R_g$ in order to change its range from $V$ volts to $N\mathrm{V}$ volts (in $\mathrm{ohm}$)

Three voltmeters all having different resistances are joined as shown. When some potential difference is applied across $P$ and $Q$, their readings are $V_1,V_2$ and $V_3$ respectively. Then

The resistance of a voltmeter is $180 \mathrm{\Omega }$. When there is $5 \mathrm{V}$ potential difference across its ends, it gives full-scale deflection. What resistance (in ohm) should be connected in series to obtain a full-scale deflection at$25 \mathrm{V}$?

The resistance of an ammeter formed by converting a galvanometer will be:

A galvanometer of resistance $5 \mathrm{\Omega }$ has $100$ divisions. The maximum current it can allow is$10 \mathrm{mA}$. What resistance should be connected so that its sensitivity becomes $1$ volt per division?

An ammeter reads upto $1 \mathrm{A}.$ Its resistance is $0.81 \mathrm{\Omega }.$ To increase the range to $10 \mathrm{A},$ the value of the required shunt is :-

A microammeter has a resistance of $100 \mathrm{\Omega }$ and full scale range of $50 \mathrm{\mu A}$ It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination :-

Three voltmeters all having different resistances are joined as shown. When some potential difference is applied across $P$ and $Q$, their readings are $V_1,V_2$ and $V_3$ respectively. Then

A galvanometer having a coil resistance of $30 \mathrm{\Omega }$ shows full scale defection when a current of $2 \mathrm{A}$ passes through it. It can be converted into an ammeter to read currents upto $10 \mathrm{A}$ by :

The circular coil of a galvanometer has fifty turns. The coil has a radius of $1 \mathrm{cm}$. The coil is placed in a radial magnetic field of $0.010 \mathrm{T}$. The torsion coefficient of the spring on which the coil hangs is $3\times {10}^{-7}$ $\mathrm{N} \mathrm{m} {\mathrm{rad}}^{-1}$. Find the deviation (in degree) of the galvanometer's hand if the current through the coil is $1.0$ $\mathrm{mA}$.