Lecture8

Lecture8 - Phy7C: Lecture8:Magnetism The Study of Magnetic...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Phy 7C: Lecture 8: Magnetism The Study of Magnetic Fields
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Field Model: Magnetic Fields A source creates a magnetic field B 1 . Direction is ? . Magnitude is ? . The net field B tot is the vector sum of all the source fields. A test , placed in a magnetic field, experiences an magnetic force Magnitude given by: ? . Direction of force is: ? . We need to fill in the blanks!
Background image of page 2
Magnetic Dipoles (Compasses) Compasses or bar magnets, if allowed, will always orient north-south Why?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Magnetic Dipoles Compasses (magnetic dipoles) orient in the same direction as the magnetic field.
Background image of page 4
Magnetic Dipoles If we allow iron fillings (which are like tiny dipoles) freedom to rotate, and put them near a current- carrying wire, this is how they align:
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Magnetic Dipoles and the Source of  Magnetic Fields This tell us that a current carrying wire produces a magnetic field, so… The source of a magnetic field is a moving electric charge!! Same picture as previous slide but with view looking down the wire
Background image of page 6
The Direction of the Magnetic Field Magnetic Dipoles align with the magnetic field The picture below also tells us how to determine the magnetic field due to the wire! Notice how the magnetic field seems to “curl” around the wire
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Determining the Direction of the  Magnetic Field: Right Hand Rule #1
Background image of page 8
Field Model: Magnetic Fields A source current I creates a magnetic field B 1 . Direction is determined by RHR #1 . Magnitude is ? . The net field B tot is the vector sum of all the source fields. A test , placed in a magnetic field, experiences an magnetic force Magnitude given by: ? . Direction of force is: ? . We can now start to fill in the chart!
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Determining the Direction of the  Magnetic Field I A B C 1) Into the screen 2) Out of the screen 3) Towards the wire 4) Away from the wire 5) Points down 6) Points up 7) Another direction What is the direction of the magnetic field due to the wire at point A?
Background image of page 10
Determining the Direction of the  Magnetic Field I A B C 1) Into the screen 2) Out of the screen 3) Towards the wire 4) Away from the wire 5) Points down 6) Points up 7) Another direction What is the direction of the magnetic field due to the wire at point B?
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Magnetic Field: Review of RHR1 1) Left 2) Right 3) Up 4) Down 5) Out of the screen 6) Into the screen 7) None of these What is the direction of the magnetic field at point A? I
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/06/2009 for the course PHY 7C taught by Professor Mahmud during the Fall '08 term at UC Davis.

Page1 / 36

Lecture8 - Phy7C: Lecture8:Magnetism The Study of Magnetic...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online