# Magnetic force on current carrying conductor

Feb 20, 2018
12
By principle of Lorentz Force, a current carrying conductor experiences a force if kept in a magnetic field. Then if the conductor is not allowed to move, does the magnet providing the magnetic field also experience an equal and opposite force on itself?

#### Harald Kapp

##### Moderator
Moderator
Nov 17, 2011
13,062

Feb 20, 2018
12
Naturally according to Newton's third law.
I was having doubts because I have never seen this in any kind of motor construction. Practically, Its always the conductor that is moving.
I am designing a different kind of motor that may reply on the magnet moving instead of the conducting coil

#### Harald Kapp

##### Moderator
Moderator
Nov 17, 2011
13,062
Practically, Its always the conductor that is moving.
Take a brushed motor, hold it by the axle, the case will turn -> moving magnets.

I am designing a different kind of motor that may reply on the magnet moving instead of the conducting coil
No need to reinvent the wheel: look at synchronous motors, the rotor of which can be made from either permanent magnets or electromagnets.

Feb 20, 2018
12
Take a brushed motor, hold it by the axle, the case will turn -> moving magnets.
.
Thanks a lot. Your reply has provided the required reassurance. Not reinventing the wheel but the design is application specific and needs to be tweaked as such.

#### BobK

Jan 5, 2010
7,682
Brushless motors generally have the coils fixed and the magnets moving.

bob

#### Bluejets

Oct 5, 2014
6,187
Induction motors have aluminium coils in the rotor.

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