# Unit of Magnetic Field

Created by: Team Physics - Examples.com, Last Updated: April 25, 2024

## Unit of Magnetic Field

Unit of magnetic field measure the strength and direction of magnetic fields, essential in understanding electromagnetic phenomena and their applications. These unit encompass various scales, from the microscopic realm of atomic spins to the cosmic scale of interstellar magnetic fields. By quantifying magnetic fields, scientists and engineers can comprehend and manipulate phenomena ranging from the Earth’s magnetic field to magnetic materials’ behavior in technological devices.

## What are Unit of Magnetic Field?

Unit of magnetic field measure the strength and direction of magnetic fields. The International System of Unit (SI) primarily uses the Tesla (T) as its standard unit for magnetic flux density, where 1 Tesla equals 1 Newton per Ampere per meter (N/A·m). Other commonly used unit include the Gauss (G), where 1 Tesla equals 10,000 Gauss. Additionally, in some contexts, the magnetic field is measured in Oersted (Oe), primarily used in the cgs (centimeter-gram-second) system. These unit enable scientists and engineers to quantify and understand magnetic fields in various applications, from electronics and magnetism to geophysics and astrophysics.

## Unit of Magnetic Field Formula

B = F/sin(θ)

Where:

• B is the magnetic field strength,
• F is the force experienced by the charge,
• q is the charge of the particle,
• v is the velocity of the particle, and
• θ is the angle between the velocity vector and the magnetic field vector.

## SI Units of Magnetic Field

SI Unit: Tesla (T)

The Tesla (T) is the standard unit of magnetic field strength in the International System of Unit (SI). One Tesla is equivalent to one Newton per Ampere per meter (N/A·m). It represents the strength of a magnetic field experienced by a unit charge moving at a velocity of one meter per second perpendicular to the field, resulting in a force of one Newton. The Tesla is commonly used in physics, engineering, and various scientific disciplines to quantify magnetic fields in different applications, ranging from electronics and magnetism to geophysics and astrophysics.

## CGS Unit of Magnetic Field

CGS Unit: Gauss (G)

The Gauss (G) is a unit of magnetic field strength in the CGS system, which stands for Centimeter-Gram-Second. One Gauss is equal to one Maxwell per square centimeter (Mx/cm^2), where a Maxwell is the unit of magnetic flux.

In practical terms, the Gauss measures the intensity of a magnetic field. For example, a refrigerator magnet typically has a magnetic field strength of a few hundred Gauss, while Earth’s magnetic field at its surface is approximately 0.5 Gauss.

The Gauss is commonly used in various fields such as magnetism, geophysics, and materials science to quantify magnetic fields in different applications.

## Intensity of Magnetic Field unit

The intensity of magnetic field is typically measured using unit such as Tesla (T) in the International System of Unit (SI), or Gauss (G) in some contexts. These unit quantify the strength of magnetic fields, aiding in various scientific and engineering applications, from magnetism research to medical imaging.

## List of Magnetic Field Unit

### Tesla (T)

1 T = 1 N/(A·m)

The Tesla is the SI unit of magnetic field strength. One Tesla is equivalent to one Newton per Ampere per meter (N/A·m), representing the magnetic flux density. It is commonly used in scientific and engineering applications.

### Gauss (G)

1 G = 10⁻⁴ T

The Gauss is a unit of magnetic induction, named after Carl Friedrich Gauss. One Gauss is equal to 10⁻⁴ Tesla. It is often used in older literature and some specialized applications, particularly in the field of magnetism.

### Oersted (Oe)

1 Oe = 250/(π A/m)

The Oersted is a unit of magnetic field strength in the centimeter-gram-second (cgs) system. One Oersted is equivalent to 250/(π A/m) or approximately 79.5775 A/m. It is primarily used in magnetic materials science and some engineering applications.

### Weber per square meter (Wb/m²)

1 Wb/m² = 1 T

The Weber per square meter is a unit of magnetic flux density. One Weber per square meter is equivalent to one Tesla. It represents the total magnetic flux passing through a unit area perpendicular to the magnetic field.

### Kilogauss (kG)

1 kG = 10⁻¹ T

The Kilogauss is a unit of magnetic induction equal to 10⁻¹ Tesla or 100 Gauss. It is often used in applications where magnetic fields are relatively strong, such as in magnetic resonance imaging (MRI) and magnetic separation.

### Millitesla (mT)

1 mT = 10⁻³ T

The Millitesla is a subunit of the Tesla, equal to one-thousandth of a Tesla or 10⁻³ Tesla. It is commonly used to express magnetic field strengths in smaller scales, such as in laboratory experiments and measurements.

### Microtesla (μT)

1 μT = 10⁻⁶ T

The Microtesla is another subunit of the Tesla, equal to one-millionth of a Tesla or 10⁻⁶ Tesla. It is used to measure very weak magnetic fields, such as those encountered in Earth’s magnetic field or magnetic field surveys.

## Conversion of Magnetic Field Units

### Tesla to Gauss (1 T to G)

1 T = 10⁴ G
• This conversion factor indicates that 1 Tesla is equal to 10^4 Gauss.
• For example, if you have 10 Tesla, you can convert it to Gauss by multiplying 10 by 10^4, resulting in 100,000 Gauss.

### Gauss to Tesla (1 G to T)

1 G = 10⁻⁴ T
• This conversion factor states that 1 Gauss is equal to 10^-4 Tesla.
• For instance, if you have 10 Gauss, you can convert it to Tesla by multiplying 10 by 10^-4, resulting in 0.001 Tesla.

### Tesla to Oersted (1 T to Oe)

1 T = 10⁴/(250/π) Oe
• This conversion factor expresses that 1 Tesla is equal to 10^4/(250/π) Oersted.
• For example, if you have 10 Tesla, you can convert it to Oersted by multiplying 10 by 10^4/(250/π), resulting in approximately 40.09 Oersted.

### Oersted to Tesla (1 Oe to T)

1 Oe = (250/π) × 10⁻⁴ T
• This conversion factor states that 1 Oersted is equal to (250/π) × 10^-4 Tesla.
• For instance, if you have 10 Oersted, you can convert it to Tesla by multiplying 10 by (250/π) × 10^-4, resulting in approximately 0.0796 Tesla.

## What are some practical applications of magnetic field unit?

Magnetic field units find extensive use in various fields, including electronics, materials science, medical imaging, and geophysics.

## Why are multiple units necessary for measuring magnetic fields?

Magnetic fields vary widely in strength, from minute fields in everyday objects to immense fields in celestial bodies. Having multiple units like Tesla, Gauss, and Oersted allows scientists and engineers

## How do magnetic field units contribute to our understanding of the universe?

Magnetic fields permeate the cosmos, influencing celestial bodies, galaxies, and the interstellar medium. Units like Tesla, Gauss, and Oersted facilitate the study of cosmic magnetism, helping astronomers unravel mysteries such as the origin of magnetic fields

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