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Right Hand Rule and Left Hand Rule.

Left Hand Generator Rule:

Can be used to to determine the relationship of the motion of the conductor in a magnetic field to the direction of the induced current. To use the left hand rule, place the thumb, forefinger, and center finger at right angles to each other. The forefinger points in the direction of the field flux, assuming that magnetic lines of force are in a direction of north and south.. The thumb points in the direction of thrust, or movement of the conductor, and the center finger shows the direction of the current induced into the armature.

Here is a easier way to remember this:

Thumb = Thrust

Forefinger = Flux

Center finger = Current

 

Right Hand Motor Rule:

Used to determine the rotation of the armature when the magnetic field polarity of the pole pieces and the direction of current flow through the armature is known. The thumb indicates the direction of thrust or movement of the armature. The forefinger indicates the direction of the field flux assuming that flux lines are in a direction of north to south, and the center finger indicates the direction of current flow through the armature.

Here is a easier way to remember this:

Thumb = Thrust (direction of armature rotation)

Forefinger = Field (direction of magnetic field)

Center finger = Current (direction of armature current)

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