Please enable JavaScript.
Coggle requires JavaScript to display documents.
P7 (Motor effect (The force depends on a number of things (How much…
P7
Motor effect
The motor effect is the term used when a current-carrying wire in the presence of a magnetic field experiences a force
A simple experimental demonstration will show you that this is true. Place a wire that is connected to a power pack in between the poles of a horseshoe magnet.
-
The first two points are pretty much obvious, so let's look at the third point in a little more detail. The magnetic field of a horseshoe magnet points pretty much in a straight line from the north pole to the south pole
-
Fleming's Left-Hand Rule
Hold out the thumb, first finger, and second finger of your left hand so all three are at right angles
If you point the seCond finger in the direction of the Current (which flows from the positive to the negative terminal of the battery), and the First finger in the direction of the Field (which flows from the North to the South pole of the magnet), your thuMb will show the direction in which the wire Moves.
electric motors
Electric motors involve rotating coils of wire which are driven by the magnetic force exerted by a magnetic field on an electric current
Suppose you take a length of ordinary wire, make it into a big loop, and lay it between the poles of a powerful, permanent horseshoe magnet.
Now if you connect the two ends of the wire to a battery, the wire will jump up briefly
When an electric current starts to creep along a wire, it creates a magnetic field all around it.
If you place the wire near a permanent magnet, this temporary magnetic field interacts with the permanent magnet's field.
-
