Moving Coil Galvanometer

Statement -1: The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic materials as a core inside the coil.

Statement -2: Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.

In a moving coil galvanometer, the torque on the coil can be expressed as $\mathrm{\tau }=\mathrm{ki}$, where $\mathrm{i}$ is the current through the wire and $\mathrm{k}$ is a constant. The rectangular coil of the galvanometer having number of turns $\mathrm{N}$, area $\mathrm{A}$, and moment of inertia $\mathrm{I}$, is placed in magnetic field $\mathrm{B}$. Find the torsional constant of the spring, if a current ${\mathrm{i}}_0$ produces a deflection of $\frac{\pi }{2}$ in the coil in reaching the equilibrium position.

A moving coil galvanometer on connecting with a high resistance in series is converted into:

If the galvanometer $G$ does not show any deflection in the circuit shown, the value of $R$ is given by:

When a resistance of $5 \mathrm{\Omega }$ is shunted with a moving coil galvanometer, it shows a full scale deflection for a current of $250 \mathrm{mA},$ however when $1050 \mathrm{\Omega }$ resistance is connected with it in series, it gives full scale deflection for $25$ volt. The resistance of galvanometer is$\mathrm{\_\_\_\_\_\_\_\_\_\Omega }.$

The current sensitivity of moving coil galvanometer is increased by $25\%$. This increase is achieved only changing in the number of turns of coils and area of cross section of the wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be:

Given below are two statements:

Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity becomes double.

Statement II: Increasing current sensitivity of a moving coil galvanometer by only increasing the number of turns in the coil will also increase its voltage sensitivity in the same ratio

In the light of the above statements, choose the correct answer from the options given below:

In a moving coil galvanometer, if number of turns increases by $25\%$, then change in voltage sensitivity is

A coil of area $A$, number of turns $\mathrm{N}$ and resistance $R$ is rotating in a radial magnetic field $B$ with an angular speed $\omega$. What is the maximum power consumed by the coil?

How does a galvanometer work?

What is the function of a galvanometer?

In the given figure, if galvanometer shows null deflection then emf of each cell will be

Two tangent galvanometers $A$ and $B$ have coils of radii $8 \mathrm{cm}$ and $16 \mathrm{cm}$ respectively and resistance $8 \mathrm{\Omega }$ each. They are connected in parallel with a cell of emf $4 \mathrm{V}$ and negligible internal resistance. The deflections produced in the tangent galvanometers $A$ and $B$ are $30° \text{and} 60°$ respectively. If $A$ has $2$ turns, then the number of turns $B$ must have is

A galvanometer of resistance $\mathrm{30 }\mathrm{\Omega }$ is connected to a battery of emf $\mathrm{2\; V}$ with $\mathrm{1970 }\mathrm{\Omega }$ resistance in series. A full scale deflection of $20$ divisions is obtained in the galvanometer. To reduce the deflection to $10$ divisions, the resistance in series required is____$\mathrm{\Omega }$.

The advantage of moving coil galvanometer-The torque to weight ratio is____________________?

Moving coil galvanometer can be used only to measure direct _____..

A moving coil galvanometer has very high sensitivity. 

What are the disadvantages of moving coil galvanometer?

What are the advantages of moving coil galvanometer?

The moving coil galvanometer is made up of a rectangular coil that has many turns and it is usually made of thinly insulated or fine copper wire that is wounded on a metallic frame.This statement is true or false?