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Physics Magnetic Field (Circular Path) watch
- Thread Starter
Last edited by JF-17; 21-01-2017 at 22:02.
- 21-01-2017 19:16
(Original post by JF-17)
- 21-01-2017 21:07
In a demonstration, electrons with 200eV of kinetic energy are going round in a 12cm diameter circle. Calculate the magnetic flux density. Give your answer to 2 significant figures.
The Lorentz force is given by
The centripetal force for the electrons is
Equating these two forces since it is the magnetic field which provides the force on the electrons so that they follow the circular path.
So you use this formula to calculate the magnetic field, using the mass and charge of an electron