Give principle, construction, working and labeled diagram of a moving coil
galvanometer. Find the expression for its current sensitivity.
(OR)
Derive an expression for force between two parallel current-carrying conductors and
hence give definition of ampere. Draw diagram representing direction of force for
current in same direction.
Answers
Answer:
principle = when the current carrying conductor placed inside the magnetic field experiences force.
costruction =the electric motor consists of rectangular loop of copper wire having resistive coating. it is placed between north pole and south pole of the horseshoe magnet in such a way that its branches AB&CD are perpendicular to the direction of the magnetic field. the two ends of the loop are connected to the two halves X&Y of the split ring two halves have resistive coating in their inner surfaces &are tightly fitted on the axle. two halves of split ring X&Y have their outer conducting surfaces in contact with the two stationary carbon brushes .
working =a force is exerted o branch AB and pushes it down m the current in the CD branch is in a opposite direction .thus,the loop and the axle start rotating in an anti clockwise direction after half rotation two halves of split ring X and Y come in contact with carbon brushes. the current start flowing in the direction DCBA.