lecture 14 101012 - 10/12/2010 Electric Charges in Magnetic...

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10/12/2010 1 Electric Charges in Magnetic Fields Moving charges feel magnetic force perpendicular to path of motion This force has a maximum value when the charge moves perpendicularly to the magnetic field lines This force is zero when the charge moves along the field lines This force is zero if the charge is stationary Superconducting magnets 300000 Gauss or 30 Tesla Earth’s magnetic field 0.5 G or 5 x 10 -5 T sin Bqv F Quick Quiz How many G in a T? A. 10 -5 D. 10 5 B. 10 -4 E. 0.5 x 10 -5 C. 10 4 Right Hand Rule #1 Place your fingers in the direction of Curl the fingers in the direction of the magnetic field, Your thumb points in the direction of the force, , on a positive charge If the charge is negative, the force is opposite that determined by the right hand rule v B F Direction of B Field produced by a Long Straight Current carrying Wire Right Hand Rule #2 Grasp the wire in your right hand Point your thumb in the direction of the current Your fingers will curl in the direction of the field Current in wire is moving charge Produces Magnetic Field André-Marie Ampère 1775 – 1836 Credited with the discovery of electromagnetism Relationship between
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lecture 14 101012 - 10/12/2010 Electric Charges in Magnetic...

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