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- State Fleming’s left-hand rule.
- Write the principle of working of an electric motor.
- Explain the function of the following parts of an electric motor.
- Armature
- Brushes
- Split ring
- Armature
- Brushes
- Split ring
(a) According to Fleming's left-hand rule, when the left hand's thumb, forefinger (or, index finger) and centre finger (or, middle finger) are held mutually perpendicular to one another and adjust in such a way that the forefinger points in the direction of the magnetic field, and the centre finger points in the direction of the current, then the direction in which thumb points, gives the direction of force acting on the conductor.
Image is posted for reference only
(b) The working principle of an electric motor is based on the magnetic effect of current. When a straight wire is moved in the magnetic field, induced current flows in it.
(c) (i) Armature - It is a coil that carries current and rotates in the magnetic field.
(ii) Brushes - They are used to make contact with rotating spilt rings so as to supply current to the armature.
(iii) Split ring - It is used for reversing the direction of flow of current through.
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