Question

In half deflection method, the resistance of resistance box in series with the galvanometer is 10,000.

When the galvanometer is shunted with 10  resistance, its reading drops to half the initial value.

The resistance of galvanometer is :​

Answer 1

An electron is a negatively charged subatomic particle. It can be either free (not attached to any atom), or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of various radii, representing energy levels. The larger the spherical shell, the higher the energy contained in the electron.

In electrical conductors, current flow results from the movement of electrons from atom to atom individually, and from negative to positive electric poles in general. In semiconductor materials, current also occurs as a movement of electrons. But in some cases, it is more illustrative to envision the current as a movement of electron deficiencies from atom to atom. An electron-deficient atom in a semiconductor is called a hole. Holes "move" from positive to negative electric poles in general.

The charge on a single electron is considered as the unit electrical charge. It is assigned negative polarity. The charge on an electron is equal, but opposite, to the positive charge on a proton or hole. Electrical charge quantity is not usually measured in terms of the charge on a single electron, because this is an extremely small charge. Instead, the standard unit of electrical charge quantity is the coulomb, symbolized by C, representing about 6.24 x 1018 electrons. The electron charge, symbolized by e, is about 1.60 x 10-19 C. The mass of an electron at rest, symbolized me, is approximately 9.11 x 10-31 kilogram (kg). Electrons moving at an appreciable fraction of the speed of light, for example in a particle accelerator, have greater mass because of relativistic effects.

Answer 2

Answer:

In this experiment the resistance of the galvanometer is about 10.01 Ω.

Explanation:

The half deflection experiment consists of a galvanometer, resistance box having high resistance, voltage supply and shunt resistance.

Initially current is passed to galvanometer with the high resistance attached. After that shunt resistance is applied so that the deflection becomes half of the initial.

The formula for resistance of galvanometer is given by

G = RS/(R-S)

where G is the galvanometer resistance, R is the resistance of resistance box and S is the resistance of shunt resistance.

Here,

Resistance of resistance box, R = 10,000 Ω.

Resistance of shunt resistance, S = 10 Ω.

So,

G = RS/(R-S)

G = 10000×10/(10000-10)

By solving,

G = 10000/999 = 10.01 Ω

So, the resistance of galvanometer is given by 10.01 Ω in this half deflection experiment.