To findout the direction of force in the electric motor which rules is used?
(i) Flemings right hand rule
(ii) Flemings left hand rule(iii) Right plam rule of right hand
(iv) Left palm rule of left hand
Answers
To find out the direction of force in the electric motor, Fleming’s Left Hand Rule is used. It is assumed that the thumb supplies direction of force or the motion applied over the conductor.
Fleming’s Left Hand Rule
Hold out your left hand with the thumb, fore finger and second finger at right angle to each other. Assume that the fore finger represents the field direction, second finger represents the current and thumb finger represents the direction of force.
Fleming’s Left Hand Rule is used to find the direction of force in the electric motor.
Explanation:
It is found that whenever a current carrying conductor is placed inside a magnetic field, a force acts on the conductor, in a direction perpendicular to both the directions of the current and the magnetic field.
Please refer to the attached picture for a pictorial representation of the Fleming's Left Hand Rule.
In the picture, the index finger represents the direction of the magnetic field, middle finger represents the direction of the current, and the thumb represents the direction of the force.