# Formula Specific Charge of a particle in a Magnetic Field Electric charge    Mass    Acceleration voltage    Magnetic field    Radius

## Electric charge

Unit
Electric charge of the particle (e.g. electron) moving on a circular path in a magnetic field.

The ratio of the charge $$q$$ to the mass $$m$$ of the particle is called specific charge $$\frac{q}{m}$$. For example, the electron has the following specific charge: $$\frac{q}{m} = - 1.758 \cdot 10^{11} \, \frac{\text C}{\text{kg} }$$.

## Mass

Unit
Mass of the particle.
• If the particle is a electron, then the mass is $$m = 9.1 \cdot 10^{-31} \, \text{kg}$$.
• If the particle is a proton, then the mass is $$m = 1.67 \cdot 10^{-27} \, \text{kg}$$.

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## Acceleration voltage

Unit
Accelerating voltage set, for example, in the electron gun in the teltron tube experiment to change the velocity of electrons or other charged particles.

## Magnetic field

Unit
Magnetic flux density describes how strong the magnetic field is in which the charged particle moves.

Radius of the circular path on which the charged particle moves. By changing the magnetic field $$\class{violet}{B}$$ you can easily make the radius $$r$$ of the circular path larger or smaller.