Galvanometer constant of tangent galvanometer depends upon earths magnetic field.

Content Curator

Tangent galvanometer is an instrument used to measure the small currents in a circuit. The instrument consists of a circular coil of wire, usually made of copper, mounted on a horizontal axis. The coil is suspended between the poles of a permanent magnet, which creates a uniform magnetic field inside the coil. A thin, light magnetic needle is suspended at the center of the coil, parallel to the plane of the coil. The needle is free to rotate about a vertical axis, and it aligns itself with the magnetic field.

The principle of the tangent galvanometer is based on the fact that when a current-carrying wire is placed in a magnetic field, a force is exerted on the wire. The magnitude of this force depends on the strength of the magnetic field, the length of the wire, and the current passing through the wire. The direction of the force is perpendicular to both the magnetic field and the direction of the current.

The galvanometer constant of a tangent galvanometer is defined as the ratio of the magnetic field strength to the current required to produce a deflection of one tangent division on the scale. It is denoted by the symbol G.

G = B/I

B is the magnetic field strength; I is current required to produce deflection of one tangent division on scale

The galvanometer constant of a tangent galvanometer depends on the strength of the earth's magnetic field. The earth's magnetic field is not uniform, and its strength varies from place to place. The galvanometer constant of a tangent galvanometer is maximum when it is aligned with the direction of the earth's magnetic field. This is because the maximum force is exerted on the wire when it is perpendicular to the magnetic field, and the force is directly proportional to the magnetic field strength.

If the tangent galvanometer is not aligned with the direction of the earth's magnetic field, the galvanometer constant will be smaller. This is because the force exerted on the wire is not perpendicular to the magnetic field, and only the component of the force perpendicular to the field contributes to the deflection of the needle.

Therefore, to obtain accurate readings with a tangent galvanometer, it is necessary to align it with the direction of the earth's magnetic field. This can be done by using a compass or a declination instrument. The galvanometer constant can also be determined experimentally by measuring the deflection of the needle for different values of the current and the magnetic field strength, and then calculating the ratio B/I.

Also check:

Related Articles
DC Generator	Ohm’s Law	Electric Current and Circuit
Electrical energy and power	Types of Circuits	Resistivity
Difference between watts and volts	Electrical Resistance	Difference between series and parallel circuits

CBSE CLASS XII Related Questions

1.
Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.

View Solution

2.
Consider the nuclear reaction $ X \to Y + Z $. Let $ M_x $, $ M_y $, and $ M_z $ be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

$ (M_x - M_z)<M_y $
$ (M_x - M_y)<M_z $
$ M_x>(M_y + M_z) $
$ M_x<(M_y + M_z) $

View Solution

3.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

The total charge of the two spheres is conserved.
Both spheres attain the same potential.
The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2)}{(r_1 + r_2)}$
The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2) (r_1 + r_2)}{r_1 r_2}$

View Solution

4.
Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.

View Solution

5.
This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?

View Solution

6.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

Galvanometer constant of tangent galvanometer depends upon earths magnetic field.

CBSE CLASS XII Related Questions

2.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

3.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

4.
Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.

5.
This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?

6.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

Comments

SUBSCRIBE TO OUR NEWS LETTER

Galvanometer constant of tangent galvanometer depends upon earths magnetic field.

CBSE CLASS XII Related Questions

2.Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

3.Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

4.Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.

5.This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?

6.A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

Comments

SUBSCRIBE TO OUR NEWS LETTER

2.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

3.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

4.
Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.

5.
This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?

6.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.