## Unit of Magnetic Field – Class 11 | Chapter – 2 | Physics Short Notes Series PDF for NEET & JEE

Unit of Magnetic Field: A magnetic field is a force field that is generated by the motion of electric charges, such as the motion of electrons in an electric current or the motion of the Earth’s molten iron core. The magnetic field is a vector field, meaning that it has both a magnitude and a direction at each point in space. A magnetic field exerts a force on magnetic materials, such as iron or steel, and can also affect the motion of charged particles, such as electrons, that are moving within the field. The strength of a magnetic field is usually measured in units of tesla (T) or gauss (G), with one tesla equaling 10,000 gauss.

## Unit of Magnetic Field

The magnetic field is denoted by B and H.

• The SI unit of H magnetic field is amperes per meter.
• The SI unit of B magnetic field is Newtons per meter per ampere or Teslas.

The unit of magnetic field is the tesla (T) in the International System of Units (SI). One tesla is defined as the magnetic field intensity that exerts a force of one newton on a current of one ampere that is perpendicular to the magnetic field.

Another commonly used unit of magnetic field is the gauss (G), which is equal to 1/10,000 of a tesla. The gauss is more commonly used in older literature and in some fields, such as geophysics and magnetometry.

In addition to the tesla and the gauss, other units of magnetic field include the oersted, which is used to measure magnetic field intensity in cgs (centimeter-gram-second) units, and the ampere-turn per meter (AT/m), which is used to measure magnetic field strength in the context of electromagnets.

## Magnetic Force

Magnetic force is the force which emerges due to the interaction of the magnetic fields which can either be an attractive or repulsive force.

• A point of charge (q) with velocity (v) and at a given time (t), located at point (r) in presence of magnetic field B (r) and electric field E (r). The Magnetic force on electric charge q can be written as:

F = q [E (r) + B (r)] = Felectric + Fmagnetic

• This was formulated by H.A Lorentz based on the experiments of Ampere and others. This is also known as the Lorentz Force.

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