Fleming’s right hand rule is applicable for electrical generators.
As per faradays law of electromagnetic induction, whenever a conductor is forcefully moved in an electromagnetic field, an emf gets induced across the conductor. If the conductor is provided a closed path, then the induced emf causes a current to flow.
According to the Flemings right hand rule, the thumb, fore finger and middle finger of the right hand are stretched to be perpendicular to each other as shown in the illustration at right, and if the thumb represents the direction of the movement of conductor, fore-finger represents direction of the magnetic field, then the middle finger represents direction of the induced current.
if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor. The direction of this force can be found using Fleming’s Right Hand Rule.
This relation among these three directions is determined by Flemings right-hand Rule.
This rule states “Hold out the right hand with the first finger, second finger and thumb at the right angle to each other. If forefinger represents the direction of the line of force, the thumb points in the direction of motion or applied force, then second finger points in the direction of the induced current”.
The left and right hand thumb rules were founded by John Ambrose Fleming in the late 19th century.
John discovered both of these rules and named them after himself. The rules are now well known as Fleming’s left and right-hand rule
The rule for generators can be recalled by remembering that either the letters “g” and “r” is common to both “right” and “generator”, or the phrase “Jenny is always right” (“Genny” being a common shortened version of Generator).