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# 5 source of magnetic field

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### 5 source of magnetic field

1. 1. Source of Magnetic Field
2. 2. Long, Straight Current-carrying Wire
3. 3. Long, Straight Current-carrying Wire
4. 4. µ0 permeability is the measure of the ability of a material to support the formation of a magnetic field within itself.
5. 5. Long, Straight Current-carrying Wire
6. 6. Long, Straight Current-carrying Wire Sample Problem: A long, straight wire allows 3.50 A through it, What is the magnitude of the magnetic field 25.0cm from the wire?
7. 7. Answer -6 T B=2.80x10
8. 8. Center of a Circular Current-carrying Loop
9. 9. Center of a Circular Current-carrying Loop r=radius of the loop B=magnetic field strength I=current µ0=permeability of free space (4Π x 10-7 m/A)
10. 10. Center of a Circular Current-carrying Loop r=radius of the loop B=magnetic field strength I=current µ0=permeability of free space (4Π x 10-7 m/A) B=µ0I / 2r
11. 11. Center of a Circular Current-carrying Loop Sample Problem: A circular loop with a diameter of 15.0cm lies on a horizontal plane as viewed from above. Through it is a 3.80A of current moving clockwise. What is the magnitude and direction of magnetic field at its center?
12. 12. Answer -5 T B=3.18x10
13. 13. Current carrying Solenoid
14. 14. Current carrying Solenoid N=no. of loops L=length of coil B=magnetic field strength I=current µ0=permeability of free space (4Π x 10-7 m/A)
15. 15. Current carrying Solenoid N=no. of loops L=length of coil B=magnetic field strength I=current µ0=permeability of free space (4Π x 10-7 m/A) B=µ0NI / L
16. 16. Sample Problem A solenoid 150.0cm long with 1.550 turns has a central magnetic field of 1.50mT. Find the current through the coil.
17. 17. Answer B= 1.16 T
18. 18. Exercises: A long, straight wire allows 6.20 A through it, What is the magnitude of the magnetic field 17.0cm from the wire? 2. A solenoid 15.0 m long with 2.50 turns has a central magnetic field of 7.80 T. Find the current through the coil. 3. A circular loop with a diameter of 20.0 m lies on a horizontal plane as viewed from above. Through it is a 4.80A of current moving clockwise. What is the magnitude of magnetic field at its center? 1.