CBSE Class 10 Science 2018 Solved Paper

© examsnet.com
Question : 21
Total: 27
(a) State Fleming's left hand rule.
(b) Write the principle of working of an electric motor.
(c) Explain the function of following parts of an electric motor :
(i) Armature (ii) Brushes (iii) Split ring.
Solution:  
(a) According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.
© examsnet.com
Go to Question: