The figure below shows an electromagnetic relay being used to switch an electric motor on and off. The electromagnet consists of a coil of wire...

      

The figure below shows an electromagnetic relay being used to switch an electric motor on and off. The electromagnet consists of a coil of wire wrapped around a core. The motor in figure is switched off.
pic992019827.png
(a) Suggest suitable material for the core.
(b) What happens to the core when switch S is closed?
(c) Why do the contacts A and B close when the switch S is closed.
(d) When the switch S is opened, what will happen to;
(i) The core
(ii) Soft iron armature.

  

Answers


sharon
(a) Soft iron
(b) The current flows through the solenoid; it is magnetized and attracts the soft iron armature.;
(c) The magnetized core attracts the soft iron armature. The pivot armature pushes the springy metal strip which joins contact B and A.;;
(d)
(i) The core
It loses its magnetism;
(ii) Soft iron armature.
Soft iron goes back to its original position thus switching off the current in the circuit.;
sharon kalunda answered the question on September 9, 2019 at 05:30


Next: The grid below is a Periodic Table. The letters used are not the actual chemical symbols of the elements. Study the table and answer the...
Previous: To determine the heat of combustion of ethanol, a form four class used the set-up shown below.

View More Physics Questions and Answers | Return to Questions Index


Exams With Marking Schemes

Related Questions