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DC Theory 28

Understanding the principles of electromagnetism

QuestionAnswer
1. When current flows through a conductor a ___ field is created that forms ___ circles radiating out from the conductor magnetic, concentric
2. Describe the left hand rule for determining the direction of the magnetic field when current flows through a conductor page 274
3. If you know the direction of current flow in a conductor, how can you determine the direction of flux lines direction of fingers
4. The strength of an electromagnetic field can be increased by increasing the ___ flowing through the conductor current
5. Draw magnetic fields page 276
6. Which of the pairs above will attract each other and which will repel C will repel
7. When a current carrying conductor is wound in a coil, a magnetic field is produced that will have a __ and ___ pole north, south
8. Increasing the number of loops will increase the __ of the magnetic field strength
9. What measurement is used to denote the magnetic field strength of a coil or electromagnet ampere turns
10. Wrapping the windings closer together will create a __ magnetic field stronger
11. Adding a core of ferromagnetic material to the coil __ (increases/decreases) the number of flux lines passing through the center of the coil, thereby __(increasing/decreasing) the strength of the magnet increases, increasing
12. When a core is ___, there is no longer a change in the strength of the magnetic field when current through the coil is increased saturated
13. A concept of electromagnets is that it takes energy to __ a magnet but does not take energy to __ a magnet make, maintain
14. Explain why soft iron is used for the core of an electromagnet High permeability, low reluctance will not become permanently magnetized
15. Draw p 277
16. How can the north and south poles of a coil or electromagnet be determined left hand coil
17. What causes electrons to move in a conductor that forms a complete circuit when the conductor is passed through a magnetic field interaction between the magnetic field and conductor
18. Changing the direction of the conductor passing through the flux lines will change the ___ of the current flow direction
19. In order for a magnetic field to induce a voltage into a conductor, there must be ___ between the two relative motion
20. If a conductor is moving parallel with the flux lines, ___ volts will be induced 0
Created by: JoshHampton
 

 



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