Physics 1201Electricity, Magnetism and ModernPhysics Lecturer: Tom Humanic Contact info:Office: Physics Research Building, Rm. 2144Email: humanic@mps.ohio-state.eduPhone: 614 247 8950 Office hours:Wednesday 11:30 am & Thursday 11:00 am and by appointment My lecture slides will be posted before my lecture on my website athttp://www.physics.ohio-state.edu/ humanic/
Course Overview Electricityelectric forceelectric field and potentialelectric currents, DC circuits and circuit devicesMagnetismmagnetic forcemagnetic fieldElectricity and Magnetism combinedmagnetic fields --- electric currentselectromagnetic waves -- lightoptics -- mirrors and lensesModern PhysicsSpecial RelativityWave nature of matterModel of the AtomNuclear Physics
Chapter 16Electric charge andCoulomb’s law
The Origin of ElectricityThe electrical nature of matter is inherentin atomic structure.m p 1.673 10 27 kgmn 1.675 10 27 kgme 9.11 10 31 kge 1.60 10 19 CCharge of electronand proton, smallestnon-zero charge possibleCoulomb -- SI unit of charge
The Origin of ElectricityIn nature, atoms are normallyfound with equal numbers of protonsand electrons, so they are electricallyneutral.By adding or removing electronsfrom matter it will acquire a netelectric charge with magnitude equalto e times the number of electronsadded or removed, N.q Ne
The Origin of ElectricityExample 1 A Lot of ElectronsHow many electrons are there in one coulomb of negative charge?q Neq1.00 C18N 6.25 10-19e 1.60 10 Ca lot!
Charged Objects and the Electric Force(ebonite is hard rubber)It is possible to transfer electric charge from one object to another bymoving around electrons, which move easier than positive charges.The body that loses electrons has an excess of positive charge, whilethe body that gains electrons has an excess of negative charge.
Charged Objects and the Electric ForceLAW OF CONSERVATION OF ELECTRIC CHARGEDuring any process, the net electric charge of an isolated systemRemains constant (is conserved).
Charged Objects and the Electric ForceLike charges repel and unlikecharges attract each other.
Conductors and InsulatorsNot only can electric charge exist on an object, but it can also movethrough an object.Substances that readily conduct electric charge are called electricalconductors.Materials that conduct electric charge poorly are called electricalinsulators.
Charging by Contact and by InductionCharging by contact.
Charging by Contact and by InductionCharging by induction.
Charging by Contact and by InductionThe negatively charged rod induces a slight positive surface chargeon the plastic by polarizing the plastic molecules.
Coulomb’s Law
Coulomb’s LawCOULOMB’S LAWThe magnitude of the electrostatic force exerted by one point chargeon another point charge is directly proportional to the magnitude of thecharges and inversely proportional to the square of the distance betweenthem.F kanalogous toNewton’s law ofGravitation!q1 q2r2ε ο 8.85 10 12 C 2 (N m 2 )permittivity of free spacek 1 (4πε o ) 8.99 109 N m 2 C 2
Coulomb’s LawExample 3 A Model of the Hydrogen AtomIn the Bohr model of the hydrogen atom, the electron is in orbit about thenuclear proton at a radius of 5.29x10-11m. Determine the speed of theelectron, assuming the orbit to be circular.F kq1 q2r2
Coulomb’s LawF kq1 q2r2 (8.99 10922)(N m C 1.60 10(5.29 10 11m 19C2)2) 8.22 10 8NF mac mv 2 r(8.22 10 N )(5.29 10 8v Fr m -319.11 10 kg 11m) 2.18 106ms
Coulomb’s LawExample 4 Three Charges on a LineDetermine the magnitude and direction of the net force on q1.
Coulomb’s LawF12 kF13 kq1 q2r2q1 q3r2(8.99 10 9(8.99 10 )()() 2.7 N)()() 8.4NN m 2 C 2 3.0 10 6 C 4.0 10 6 C(0.20m )29N m 2 C 2 3.0 10 6 C 7.0 10 6 C(0.15m )2 F F12 F13 2.7 N 8.4 N 5.7N
Coulomb’s LawExample 5 Three Charges in 2-dimensionsDetermine the magnitude and direction of the net force on q1.
Modern Physics Special Relativity Wave nature of matter Model of the Atom Nuclear Physics . Chapter 16 Electric charge and Coulomb’s law . The Origin of Electricity The electrical nature of matter is inherent i
PHY 121 ELECTRICITY, MAGNETISM AND MODERN PHYSICS 1.0 Introduction PHY132 electricity, magnetism and modern physics is a one semester 2 credits, foundation level course. It will be available to all students to take towards the c
510 racking the AP Physics C ExamC PHYSICS C Physics C has two exams: Physics C (Mechanics) and Physics C (Electricity & Magnetism): Physics C (Mechanics) Physics C (Electricity & Magnetism) First 45 min. Sec. I, Multiple Choice Sec. I, Multiple Choice 35 questions 35 questions Second 45 min. Sec. II, Free-Response
Magnetism (Section 5.12) The subjects of magnetism and electricity developed almost independently of each other until 1820, when a Danish physicist named Hans Christian Oersted discovered in a classroom demonstration that an electric current affects a magnetic compass. He saw that magnetism was related to electricity.
In Electricity and Magnetism, students study a variety of topics including electricity, circuits and magnetism through the use of student conducted laboratory, field investigations, and scientificmethods . Textbook: Any state adopted Physics textbook and an inquiry-based Physics lab manual.
Students will be able to explain how electricity and magnetism work together in electric motors and generators. Anticipatory Set Students have learned about electricity, electric circuits, voltage, and current. They are familiar with how to connect circuit elements. Electricity and magnetism are closely related.
Electricity and Magnetism For 50 years, Edward M. Purcell’s classic textbook has introduced students to the world of electricity and magnetism. This third edition has been brought up to date and is now in SI units. It features hundreds of new examples, problems, and
Physics C: Electricity and Magnetism or SAT Mathematics or ACT Mathematics or passing score on self-assessment test. PHYS 2 with a grade of C or better. AP Physics C: Mechanics with a minimum score of 4. AP Physics C: Electricity and Magnetism with a minimum score of 4. SAT Mathematics with a minimum score of 650.
3039/D 3039M untuk pengujian tarik dan ASTM D 4255/D 4255M-83 untuk pengujian geser. Serat rami yang digunakan adalah serat kontinyu dengan kode produksi 100% Ne 14’S, menggunakan matriks berupa .