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Physics 2080 Chapter 22 Part A

by: Amanda Biddlecome

Physics 2080 Chapter 22 Part A Physics 2080

Marketplace > Clemson University > Physics 2 > Physics 2080 > Physics 2080 Chapter 22 Part A
Amanda Biddlecome
GPA 4.0

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About this Document

These notes cover the first half of chapter 22 which is on magnetism.
General Physics 2
Dr. Pope
Class Notes
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This 2 page Class Notes was uploaded by Amanda Biddlecome on Thursday February 25, 2016. The Class Notes belongs to Physics 2080 at Clemson University taught by Dr. Pope in Fall 2016. Since its upload, it has received 27 views. For similar materials see General Physics 2 in Physics 2 at Clemson University.


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Date Created: 02/25/16
Physics  2080   Chapter  22  Part  A:  Magnetism   February  25,  2016   Amanda  Biddlecome     1)  Magnetic  Field     -­‐Greeks  discovered  magnets  in  Magnesia     -­‐magnets  always  have  two  poles       *North  and  South     -­‐compass=a  magnet  needle  on  a  pivot       *opposite  poles  attract,  like  poles  repel     -­‐drop  something  that  can  be  magnetized  on  a  surface,  put  a  bar  magnet     under  it,  and  magnetic  field  lines  and  magnetic  field  will  show  up       *go  from  North  to  South  and  go  all  the  way  through  the  magnet     -­‐if  you  break  a  magnet,  you  create  two  new  poles  on  the  broken  ends       *magnetic  fields  can’t  cross       *field  lines  go  all  the  way  through  the  magnet  from  north  to  south         (this  is  why  a  broken  magnet  will  have  four  poles  instead  of  just  two)     -­‐put  like  poles  together  and  have  a  region  where  the  magnets  physically  can’t     go  because  of  magnetic  field  lines     -­‐Earth       *like  a  bar  magnet       *north  pole  of  the  compass  points  towards  the  earth’s  magnetic  south         pole  (and  vice  versa)         *magnetic  pole  is  off  the  axis  of  rotation  and  the  magnetic  north  pole         changes  over  time         *magnetic  field  of  earth=0.5X10 T   -­‐4   2)  Magnetic  Force  on  Moving  Charge     -­‐Magnetic  Force     F=qvBsinΘ   *F=force   *q=magnitude  of  charge   *v=velocity   *B=magnetic  field   *Θ=angle  between  the  velocity  and  the  magnetic  field       -­‐Magnetic  field     B=F/qvsinΘ   *unit=Tesla  or  Gauss:  1T=10  G   4     -­‐when  velocity  is  parallel  to  the  magnetic  field,  there  is  no  force     -­‐when  velocity  is  perpendicular  to  the  magnetic  field,  there  is  maximum  force     -­‐force,  magnetic  field,  and  velocity  yare  all  perpendicular  to  one  another  and     in  opposite  directions     -­‐Right  Hand  Rule       *thumb  goes  along  the  direction  of  velocity  with  finernail  as  an  arrow,         fingers  are  along  the  magnetic  field,  force  comes  out  of  the  palm     -­‐if  you  see  an  X,  the  aspect  in  question  is  going  into  the  screen       *if  you  see  a  dot,  the  aspect  in  question  is  coming  out  of  the  screen       *use  these  rules  for  the  Right  Hand  Rule       *positive  particle,  this  holds  up       *negative  particle,  switch  the  direction  of  the  force     -­‐neutral  particles  don’t  experience  magnetic  force     3)  Charged  Particles  in  Magnetic  Fields     -­‐particle  exhibits  circular  motion  when  positive     2 F=qvB=mv /r   r=mv/qB   *F=force   *q=charge   *v=velocity   *B=magnetic  field   *m=mass   *r=radius         *particles  going  in  circular  force  has  centripetal  acceleration     -­‐mass  spectrometer       *accelerates  charged  particles  across  a  potential  difference  to  get  a         velocity,  it  experiences  a  magnetic  field  and  thus  centripetal           acceleration       *everything  for  the  particles  is  the  same  except  for  the  mass  and         therefore  the  radius;  this  depends  on  the  material  we  have  (distance         between  radii  is  found  by  subtracting  diameters)     -­‐Cyclotron       *charged  particle  is  accelerated  until  it  gets  to  one  of  the  dees  and         then  it  goes  across  a  potential  difference  and  gains  velocity  through         acceleration       *wiggle  the  beams  to  get  them  to  where  you  want  them  to  go       *the  smaller  the  object  to  study,  the  larger  the  device  needed     -­‐Synchrotron       *accelerate  particles  to  very  high  speeds  and  particles  collide  at  high         speeds  


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