Calculating Electron Speed in a Magnetic Field

[Andreii]

Hi everyone

I would like to ask, how can i resolve this task:

electron is moving inside the magnetic field with density 0.002 T on the shape of screw with radious 2 cm (centimeters) and height of screw 5 cm. What is electron's speed? The result is 7.6 Mm/s but I am trying to see how do i get this result?

Thank you for formulas and tips.

 

[Astronuc]

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/maspec.html#c2

The force induced by the magetic field on the charged particle must equal the centripetal force of the particle.

See also - http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfor.html

Look at Lorentz force law.