Physics > Magnetism and Matter > 9.0 Deflection Magnetometer
Magnetism and Matter
1.0 Introduction
2.0 Coulomb’s Law
3.0 Magnetic Dipole
3.1 Magnetic Dipole Moment
3.2 Magnetic Field Due to a Magnetic Dipole
3.3 Torque Acting on a Magnetic Dipole
3.4 Potential Energy of a Magnetic Dipole in a Uniform Magnetic Field
4.0 Current Carrying Loop
5.0 Gauss’s Law in Magnetism
6.0 Magnetic Moment of an Atom
7.0 Earth’s Magnetism
8.0 Tangent Law
9.0 Deflection Magnetometer
10.0 Vibration Magnetometer
11.0 Magnetic Flux
12.0 Magnetic Induction
13.0 Magnetic of Material
14.0 Classification of Magnetic Materials
15.0 Curie Law in Magnetism
16.0 Hysteresis
17.0 Retentivity or Residual Magnetism
18.0 Coercivity
19.0 Permanent Magnets
20.0 Electromagnets
21.0 Important Points
9.1 Tangent Galvanometer
3.2 Magnetic Field Due to a Magnetic Dipole
3.3 Torque Acting on a Magnetic Dipole
3.4 Potential Energy of a Magnetic Dipole in a Uniform Magnetic Field
It is a device used for detection and measurement of low electric currents. Its working is based on tangent law. If $?$ is the deflection produced in galvanometer when I current flows through it, then
$$I = \frac{{2R}}{{N{\mu _o}}}H\tan \theta = \frac{H}{G}\tan \theta = K\tan \theta $$ Where $G = \frac{{N\mu }}{{2R}}$ is called galvanometer constant and $K{\text{ }} = {\text{ }}\frac{H}{G},$ is called reduction factor of tangent galvanometer. Here $N$ is number of turns in the coil and $R$ is radius of the coil. Tangent galvanometer is also called moving magnet type galvanometer.
