Study the following principle and answer the questions :
A force is excreted on a current-carrying conductor placed in a magnetic
field. The direction of this force depends on both the direction of the current
and the direction of the magnetic field. This force is maximum when the
direction of the current is perpendicular to the direction of the magnetic
field.
(a) By which law can we determine the direction of the force excreted on
the current-carrying conductor?
(b) In which electrical equipment is this principle used?
(c) Draw a diagram representing the construction of this equipment.
(d) Write the working of this equipment in brief.
Answers
Answer:
(a) By which law can we determine the direction of the force excreted the current-carrying driver?
Ans:- Fleming left hand rule
(b) In which electrical equipment is this principle used?
Ans:- Electric motor
(c) Draw a diagram representing the construction of this equipment.
Ans:- Draw diagram of electric motor
(d) Write the working of this equipment in brief.
Ans:- 1) When the circuit is completed, the current flowseonducting in the branch AB of the loop from A to B throughaxle the carbon brushes E and F.
2) Since the direction of the magnetic field is from north pole to south pole, according to the Fleming's left hand rule, a force is exerted on the branch AB in downward direction and CD in upward direction.
3) Thus, the loop and the axde start rotating in an anticlockwise direction.
4) After half rotation, the current in a loop starts flowing in the direction DCBA.
5) Therefore, a force is exerted on the branch CD in downward direction and on the branch AB in the upward direction, and the loop continues to rotate in the anticlockwise direction.
6)Thus, the current in the loop is reversed after each half rotation and the loop and the axle continue to rotate in the anticlockwise direction.
Explanation: