# Lecture 1 - One slide rules review Everything same as last...

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One slide rules review Everything same as last semester. Check K-State Online for details. Best four quizzes (400 points). Best 25 of everything else (400 points). Final exam (200 points). D,C,B,A = >600, >700, >800, >900, respectively. No make-ups. HW through WebAssign. First HW due Friday. I-clickers every lecture. One person determines group grade in studio on lab and PS for each assignment. Still on wait list for studio? You need to move to an open studio by tomorrow. WF1130 is wide open. No electronic devices except calculators and i-clickers.

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Electromagnetism in one slide Electric charges q establish electric fields E everywhere in space. An electric Q charge experiences an electric force F E =Q E , where E is the electric field at the charge’s position, and Q is the magnitude of the charge. Moving electric charges result in electric currents; electric currents establish magnetic fields B everywhere in space. A moving charge Q experiences a magnetic force F B =Q v × B , with v the velocity of the charge and B the magnetic fields at the location of the charge. Magnetic fields can also be established by time-varying electric fields. Likewise, electric fields result from time- varying magnetic fields. These coupled effects produce electromagnetic waves.
Electric charge Protons possess a charge q p =+e , electrons q e =-e , with e= 1.6 × 10 -19 Coulomb(C). Experimentally |q p +q e |/e <10 -21 , the electron charge is equal and opposite the proton charge. The total charge is Q=(N p -N e )e , with N p ,N e the number of protons,electrons. Ordinary matter is electrically neutral: Q= 0 , so N p =N e . In a typical material, water, there are ~10 6 C/mole, or 5 × 10 4 C/cm 3 of proton charge and an equal amount of electron charge.

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Let’s try the clickers How many protons are to needed for 1 C of charge? A. 1.6×10 -19 B. 1 C. 6.2×10 18 D. 6.0×10 25
The E-field of 1 charge •This is the basic building block of electric fields: – The first factor is the charge Q . Fields point away from positive charges and towards negative charges. – The second factor

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## This note was uploaded on 02/01/2012 for the course PHYS 214 taught by Professor Law during the Spring '08 term at Kansas State University.

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Lecture 1 - One slide rules review Everything same as last...

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