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# What is speed selector?

Speed selector is otherwise called Wien channel is a gadget with an opposite plan of electric and attractive fields which is utilized as a speed channel for charged particles. Speed selector abuses the guideline of movement of a charge in a uniform magnetic field. As per this rule, the power experienced by a moving accuse of speed v in a uniform attractive field is given as:

F = Bqv

Where,

F: power experienced by the charge

B: attractive field

q: moving charge

v: speed of the charge

The speed of charged particles in speed selector is $$v=\frac{E}{B}$$ is the speed required by the particles to go through the gear.

## Fields of speed selector:

Uniform electric field: This field is created by the top plate with negative charges and the base plate with the positive charges. These charges bring about the arrangement of the field which is pointing the upward way in the figure.

Uniform attractive field: This field is available consistently between the two charged plates with the end goal that it very well may be coordinated either inwards or outwards.

 Speed selector

### Limitations of speed selector:

Neither the mass nor the charge of the particles is considered before going through the filter.All the uncharged particles go through the channel.

#### Speed Selector uses :

A speed selector is utilized with mass spectrometers to select just accused particles of a particular speed for investigation.

It utilizes a math where opposing electric and magnetic forces match for a particular molecule speed. It in this manner lets through undeflected just those particles with the chose speed.