# lec23 - 23-1Physics IClass 23Magnetic Forceon Moving...

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Unformatted text preview: 23-1Physics IClass 23Magnetic Forceon Moving ChargesRev. 07-Apr-04 GB23-2Hendrick Antoon LorentzH.A. Lorentz1853-1928Hendrick A. Lorentzwas a Dutchphysicist who refined certain aspects ofelectromagnetic theory. He, along withIrish mathematical physicist George F.FitzGerald, deduced fundamentalproperties of the electromagneticbehavior of moving bodies that formedthe basis of Einstein’s Special Theoryof Relativity.The force of a magnetic field on amoving charge is sometimes called theLorentz Force.23-3Important Facts About Velocity and Net Force Vectors (Review)vFvFSame direction: speeding up.Opposite directions: slowing down.Right angles: changing direction, same speed.vF23-4Vector Cross Product (Review)bac×=; )sin(|b||a||c|φ=The direction comes from theright-hand rule. It is at a rightangle to the plane formed by aand b. In other words, the crossproduct is at right angles to bothaand b. (3D thinking required!)23-5Drawing 3D Vectors in 2DXZY+Z-Z+Y-Y-X+Z is out of page+X23-6Magnetic Force on aMoving ChargeBvqF×=q:charge of the particle (C; + or –)v:velocity of the particle (m/s)B: magnetic field (T)•Force is at a right angle to velocity.•Force is at a right angle to magnetic field....
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lec23 - 23-1Physics IClass 23Magnetic Forceon Moving...

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