SG_Chap19 - Chapter 19 Magnetism 19.1 Magnets A magnet...

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1 Chapter 19 Magnetism 19.1 Magnets A magnet always has a north pole and a south pole. Like poles repel and unlike poles attract Similar to electric fields between parallel plates Similar to the field of a positive and a negative charge (electric dipole) 19.2 Earth’s Magnetic Field
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2 19.3 Magnetic fields F = q B v sin B = F/(q v sin ) SI Unit: Tesla (1 gauss = 10 -4 Tesla) B q Only true for a positive charge. If it is a negative charge, still use the RHR. Then reverse the direction . v v v 19.4 Magnetic force on a current-carrying conductor + v • Force on 1 moving charge: – F = q v B sin( ) – Out of the page (RHR) • Force on many moving charges: – F = (q/t)(vt)B sin( ) = I L B sin( ) – Out of the page! v L = vt B I = q/t + + + + 19.4 Magnetic force on a current-carrying conductor 19.5 Torque on a loop and Motors
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3 An electric motor converts electrical energy to mechanical energy An electric motor consists of a rigid current-carrying loop that
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SG_Chap19 - Chapter 19 Magnetism 19.1 Magnets A magnet...

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