• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Magnetic field lines
 

Magnetic field lines

on

  • 987 views

 

Statistics

Views

Total Views
987
Views on SlideShare
987
Embed Views
0

Actions

Likes
0
Downloads
42
Comments
0

0 Embeds 0

No embeds

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Magnetic field lines Magnetic field lines Presentation Transcript

    • Magnetic Field Sources
    • Magnetic Fields
      • A force field that denotes the area in which the non-contact force of permanent magnets or current carrying conductors can exert their influence
      • Fields are concentrated at the poles
      • Same properties with Electric field lines except that there is no magnetic monopole
    • Magnetic field lines
    • Magnetic Force
      • Like poles repel, opposite attract
      • An object that contains iron but is not itself magnetized is attracted by either pole of a permanent magnet.
    • Magnetic Force
    • Magnetic interactions can be described as:
      • A moving charge or a current creates a magnetic field in the surrounding space (in addition to its electric field)
      • The magnetic field exerts a force F m on any other moving charge or current that is present in the field.
      • The magnetic force F m acting on a positive charge q moving with velocity v is perpendicular to both F m and the magnetic field B.
    • Units of Magnetic Fields
      • SI units: tesla , T
      • 1 tesla = 1 T = 1 N/A · m
      • Or: gauss , G
      • 1 G = 10 -4 T
    • Magnetic Force on Moving Charge
      • Moving charged particles are deflected in magnetic fields
      • Right-Hand Rule
    • Grip and Hand Rules Out of the Page In to the Page
    •  
    • Magnetic Force on Moving Charge The magnetic force is always perpendicular to v ; a particle moving under the action of a magnetic field alone moves with a constant speed.
    • Motion of charged particles in a magnetic field
    • Motion of charged particles in a magnetic field Fig. 27.18
    • Motion of charged particles in a magnetic field Fig. 27.17
    • Applications of motion of charged particles
      • Velocity Selector
      • Particles of a specific speed can be selected from the beam using an arrangement of electric and magnetic fields called a velocity selector.
    • Magnetic Force on Current Carrying Wire
    • Magnetic Force on Current Carrying Wire
    • Ampere’s Law
      • Used to determine the magnetic field yielded by current-carrying wire
      • Ampere’s law states that the product B and length of line segment around any closed path equals µ 0 times the net current through the area enclosed by the path.
      • Direction of Magnetic field is determined by corkscrew method
    • Ampere’s Law B=  0 I/2  L
    • Magnetic field profile of 2 parallel current carrying wires
    • Solution
    • Magnetic Field in Solenoid
    • Magnetic Field in Solenoid B=  0 nI
    • Ampere’s Experiment B 1 =  0 I 1 /2  L F=  0 I 1 I 2 l/2  L
    • Exercise B 1 =  0 I 1 /2  L F/l=  0 I 1 I 2 /2  L
    • Example
      • Suspending a current with a current
      • A horizontal wire carries a current I 1 =80 A dc. A second parallel wire 20 cm below it must carry how much current I 2 so that it doesn’t fall due to gravity? The lower wire is a homogenous wire with a mass of 0.12 g per meter of length.
      F/L = mg/L =1.18 x 10 -3 N/m  0 I 1 I 2 /2  L = 1.18 x 10 -3 N/m I 2 = 15 A
    • Definitions
      • Ampere current flowing in each of the two long parallel conductors 1 m apart, which results in a force of exactly 2 x 10 -7 N/m of length of each conductor.
      • Coulomb one ampere-second
    • Solution Set F/l=  0 I 1 I 2 /2  L F A /l= 5.83 x 10 -5 N/m; 90 F B /l=3.37 x 10 -5 N/m; -60 F C /l=3.37 x 10 -5 N/m; 240