National High Magnetic Field Laboratory45 tesla magnet --- highest static magnetic field in the worldJointly run by FSU, UF, and Los Alamos National LaboratoryStrong electromagnets generate BIG forcesStrong electromagnets consume enormous electric power.Classical Mechanics vs Electricity and MagnetismClassical Mechanics Electromagnetism(Mechanics of macroscopic objects whose velocity is much smaller than the speed of light.)Newton’s three laws(Only one of the laws is an equation.)Four laws(Every one of them is an equation.)Newton’s three laws and relations derived from them hold for objects experiencing electromagnetic forces.Law 1: Coulomb’s Law(Gauss’ Law, which will appear in Ch. 23, is equivalent to Coulomb’s Law.)CHECKPOINT 1A?Copper Copper D BB A D A D?The electrostatic force obeys Coulomb’s Law and Newton’s third law.CHECKPOINT 2Q1: The direction of the electrostatic force on the central proton due to the electron?distance ddeppQ2: The direction of the electrostatic force on the central proton due to the other proton?Q3: The direction of the net electrostatic force on the central proton?QUIZQ1: What will happen to the electrostatic forces, if the distance is doubled?1 m-1х10-16 CQ2: Now keep the distance and the amount of charge of the pink particle unchanged. How must the charge of the grey particle be changed in order to weaken the electrostatic forces by the same amount?3х10-16
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