1、-White background is for Teacher to see as instructions.-Blue back ground is for the Student to see Materials needed for the construction of the demos Pliers Sand paper Glue gun#1 Cathode ray tube demo Cathode ray tube set#2 Battery demo 9V battery thin copper wires rubber band a neodymium magnet(or
2、der online grand-illusions/toyshop or ebay)#3 Ferromagnetic levitation borrow a levitation device from a year 2 Mechanical Engineering 2019 friend#4 Diamagnetic levitation 4 neodymium magnets a piece of pyrolytic carbon Materials needed for the demos.Instructions will be given in later slides#5 Magl
3、ev train Strong magnetic strips thin plexiglass the support track ElectromagnetismUniversity of British ColumbiaPhysics 420By:Jason CheungA=accelerationG=gravitational constant m=mass of big objectr=distance to the center of the big objectE=Electric FieldF=Electric Forceq=Charge E is measure in Forc
4、e/CoulombInstruction and explanation for the CRT Demo#1 Turn on the Power supply and Electric plate controller,and wait and calibrate the electrons to the center of the screen#2 Adjust the electric plate by turning the X knob or the Y knob.This is to demonstrate that the electric plate can control w
5、here the electron will hit on the screen.Questions and Fun factsQ:What do you think is the application of a CRT and what do the electric plates do in the CRT?A:Our“OLD”TV(before LCD and Plasma)use this technique to view images on our TV!B=magnetic fieldF=Magnetic ForceQ=chargeV=velocity of the movin
6、g chargeMaterial needed copper loop 9V battery rubber band copper ears x2Step one:pinch the cooper ears onto the batteryStep two:tie the ears onto the battery with rubber bandStep three:put the copper loop through the holes on the copper earsFinish productCopper ears9V batteryRubber bandCopper loopS
7、how Battery Demo video under“Videos”Instruction of how to use the battery demo#1 Set up device as above#2 Bring the neodymium magnet close to the loop#3 Give a kick start for the loop by flicking itThings to tell the students-Without the magnetic field,the loop will no move-It is due to torque provi
8、ded by the magnetic force so that the loop will go round and round-Electrons-Protons and Neutrons1s22p3Electron Configuration of NitrogenWrongWrong2s2RightMagnetism is Measure in Magnetic Susceptibility(m)The more susceptibility of a material has,the more magnetic property it processesCobalt(Co)Susc
9、eptibility=70Iron(Fe)Susceptibility=200Fe:1s2,2s2,2p6,3s2,3p6,4s2,3d6 Fe:Ar,4s2,3d6 Ar:1s2,2s2,2p6,3s2,3p6=Ar“Core”Ar-The electrons seems to align spontaneously-Pure quantum mechanics effect Aluminum AlSusceptibility=Platinum PtNe.3s2.3p1 Compare to Iron(Fe)ArFe:Ar,4s2,3d6the dipoles do not interact
10、 with one another and are randomly oriented in the absence of an external field due to thermal agitation,resulting in zero net magnetic moment What is the differences between the two?!Instructions of how to use the levitation device#1 Set up the device#2 Place orange stud with the magnet side facing
11、 away from the solenoid#3 Place the stud so you can feel the solenoid is attracting the stud#4 Gently remove your hand so the device and do its workExplanation of how it works-solenoid provide the magnetic field,so the magnet will attract upward(para and ferromagnetic property).-detector in the bott
12、om is to sense if the stud is moving up or down.If it movestoo high,the detector will cut the current so the stud will come back down by gravity.If it moves too low,the detector will send current in the solenoid to generate a magnetic field,so the stud will go up again by the attraction between the magnet and magnetic field Show Ferromagnetic levitation video under“Videos”GoldCopperHuman(mostly)MRI(magnetic resonance images)Superconductors谢谢！
