Atomic Physics

Exam Prep Study Notes (Things to remember) 


22.1 Magnets

  • Magnetism is a subject that includes the properties of magnets, the effect of the magnetic force on moving charges and currents, and the creation of magnetic fields by currents.
  • There are two types of magnetic poles, called the north magnetic pole and south magnetic pole.
  • North magnetic poles are those that are attracted toward the Earth’s geographic north pole.
  • Like poles repel and unlike poles attract.
  • Magnetic poles always occur in pairs of north and south—it is not possible to isolate north and south poles.


22.2 Ferromagnets and Electromagnets

  • Magnetic poles always occur in pairs of north and south—it is not possible to isolate north and south poles.
  • All magnetism .........

 

 

 

 

 

 

 

 

 

 

  •  
  • ............. as the Hall emf, across a current-carrying conductor by a magnetic field.


  • The Hall emf is given by

    ε=Blv(B,v,andl,mutually perpendicular) 

    for a conductor of width through which charges move at a speed v.


22.7 Magnetic Force on a Current-Carrying Conductor

  • The magnetic force on current-carrying conductors is given by

    F=IlBsinθ, 

    where I  is the current, l is the length of a straight conductor in a uniform magnetic field B, and θ is the angle between and B. The force follows RHR-1 with the thumb in the direction of I.


     

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