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.

The earth behaves like a huge bar magnet with its magnetic north pole near the geographical _____ Pole.

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?

In a Radial Magnetic field:

Phosphor-bronze strip in a suspended coil galvanometer is used as a suspension fibre :

The magnetism of a magnet is due to

Two moving coil galvanometers, $X$ and $Y$ have coils with resistances $10 \mathrm{\Omega }$ and $14 \mathrm{\Omega }$, cross-sectional areas $4.8\times {10}^{-3} {\mathrm{m}}^2$ and $2.4\times {10}^{-3} {\mathrm{m}}^2$, number of turns $30$ and $45$ respectively. They are placed in magnetic fields of $0.25 \mathrm{T}$ and $0.50 \mathrm{T}$ respectively. Then the ratio of their current sensitivities and the ratio of their voltage sensitivities are respectively.

In the case of a moving coil galvanometer, the deflection is

How will the voltage sensitivity of a moving coil galvanometer change, if its current sensitivity is doubled?

Assertion: The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.

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

Assertion: The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.

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

Assertion: Poles of a magnet can never be separated.

Reason: Since each atom of a magnetic material is a magnet in itself.

To increase the sensitivity of a moving coil galvanometer, one should decrease

The deflection in a moving coil galvanometer is reduced to half when it is shunted with a 40$\mathrm{ }\mathrm{\Omega }$ coil. The resistance of the galvanometer is 

To convert a moving coil galvanometer (MCG) into a voltmeter