Magnetism (part 8)

# Magnetism (part 8) - Lecture 07 Chapter 32 F x B F = AI = B...

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Physics 113, Dr. Renat Letfullin 1 Lecture 07: Chapter 32 B x . F F θ θ μ B U - = μ B × = μ τ AI = μ

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Physics 113, Dr. Renat Letfullin 2 Today.. . Lorentz Force Magnetic Forces on Current-Carrying Wires Torques on Current Loops An Electric Motor Movie: Magnetic Field S N
Physics 113, Dr. Renat Letfullin 3 Last Time: The Hall Effect When a charged particlemoving in a vacuum, it is deflected perpendicular to its velocity by a magnetic field. In 1879, Edwin Hall, a graduatestudent at Johns Hopkins Univ., discovered that thesame behavior is truefor charged particles moving in a conductor. Edwin Herbert Hall (1855 – 1938) H m d e V F ev B F eE e w = = = = H d V wv B = / d J I A I v ne ne wtne = = = H I IB V wB wtne tne = =

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Physics 113, Dr. Renat Letfullin 4 Lorentz Force • The force F on a charge q moving with velocity v through a region of space with electric field E and magnetic field B is given by: F x x x x x x x x x x x x x x x x x x v B q → → → → → → → → → → v B q F = 0 ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ v B q F × B v q E q F × + = 2
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