# Why does an electric current cutting through a magnetic field produce a force?Watch

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#1
As the title says, I'm looking to find out the principles behind the motor effect. I take it it's something to do with electricity and magnetism being parts of the same force.

I've checked on Wikipedia and it refers to something called a 'Lorentz Force' with lots of complex derivatives and vector calculus, but no real explanation for the fundamental principles. Can anyone help?

Thanks!

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5 years ago
#2
(Original post by majmuh24)
As the title says, I'm looking to find out the principles behind the motor effect. I take it it's something to do with electricity and magnetism being parts of the same force.I've checked on Wikipedia and it refers to something called a 'Lorentz Force' with lots of complex derivatives and vector calculus, but no real explanation for the fundamental principles. Can anyone help?Thanks! Posted from TSR Mobile
1) Electrons carry the charge force which repels other electrons but are attracted to protons. (Faradays Laws)

2) Moving electrons describe electric current. (Amperes Laws)

3) When electrons move wrt to the reference frame of another charged particle, the force between them is described by a magnetic field. (Gauss' Laws)

4) Electrons moving through a conductor placed within a magnetic field, will accelerate with a vector perpendicular to the magnetic field and both force and magnetic field vectors are perpendicular to the charge motion vector. (Flemmings rules)

5) Other charged particles feel the magnetic force and can be accelerated by it. The electromagnetic force is mutual and exchanged between reference frames as long as they are moving wrt to each other. (Maxwell and Lorentz)

6) Because free electrons move through the conductor (current) by hopping between the valence shells of atomic nucleii, the the external magnetic field force cause a net motion of the conductor. i.e. magnetically accelerated electrons drag the whole conductor with them. (Newton action and reaction)

5) A motor is physically configured to harness the acceleration of electrons (and hence conductor motion) in the presence of a static magnetic field to produce a torque.(Newton, Faraday, Ampere, Gauss, Lorentz, Maxwell et al)
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