# Unit of Magnetic Field

When we talk about the magnetic field, different units are used to measure it. Basically, there are two systems of units based on the metric system used: the SI unit and CGS units. Thus, we will look at the unit of magnetic field below.

## SI Unit of Magnetic Field

Generally, the magnetic field can be defined in several specific ways in relation to its effect on the environment. Accordingly, we have the B-field and the H-field. B-field is a magnetic field defined by the force it exerts on a moving charged particle, whereas an H-field is similar to a B-field except when they are inside a material. However, they are measured differently.

In the SI System:

• B is measured in teslas represented as T.
• Whereas the H-field is measured in amperes per metre (A/m).

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### Other Common Units

Some other common unit of Magnetic Field is given below:

• Apart from the SI system, the B-field in the Gaussian-CGS system is measured with the unit gauss (G).
• If we look at the conversion it is 1 T = 10000 G.
• Meanwhile, the H-field is measured with the help of Oersted (Oe) in the CGS system.

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## Frequently Asked Questions – FAQs

Q1

### What are magnetic field lines?

Magnetic field line or lines of forces shows the strength of a magnet and the direction of a magnet’s force. It was discovered by Michael Faraday to visualise the magnetic field.
Q2

### Does Earth’s magnetic field vary at different locations??

Yes, the magnetic field is different at different locations. The magnetic field changes with both location and time. The distribution of the magnetic field is measured using satellites, and approximately 200 operating magnetic observatories worldwide, as well as several more temporary sites.
Q3

### What is the unit of magnetic field?

Magnetic field is denoted by B and H. The SI unit of H is amperes per metre and the SI unit of B is Newtons per metre per ampere or Teslas.
Q4

### What is the basic law of magnetism?

The basic law of magnetism is that unlike poles attract and like poles repel.
Q5

### State Faraday’s first law of electromagnetic induction.

Faraday’s first law of electromagnetic induction states that “Whenever a conductor is placed in a varying magnetic field, an electromotive force is induced. Likewise, if the conductor circuit is closed, a current is induced, which is called induced current.”

## Accelerate Your JEE Main & Advanced Exam Preparation by Watching this Video about Magnetism and Force on Dielectric in Charged Capacitor

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