Electromagnetism

Question 1

What are the 4 different methods to increase the turning effect in a motor?

Answer 1

1. Increase the e.m.f. supplied by dry cell or battery to drive a larger current.
2. Increase number of turns in coil.
3. Increase the magnetic field strength by using stronger magnets.
4. Winding the coil on a soft iron core to concentrate the magnetic field lines through the coil.

Question 2

What is the purpose of a Split Ring Commutator? (2 purpose)

Answer 2

To reverse the direction of current in the coil every half a revolution.
To maintain direct contact with carbon brushes.