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## week 2

by: Mary-elizabeth Notetaker

8

0

3

# week 2 Phys 222

Mary-elizabeth Notetaker
U of L

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week 2
COURSE
Fundamentals of Physics II
PROF.
Dr. Ming Yu
TYPE
Class Notes
PAGES
3
WORDS
CONCEPTS
phys222, Physics, FundamentalsOfPhysics
KARMA
25 ?

## Popular in Physics

This 3 page Class Notes was uploaded by Mary-elizabeth Notetaker on Thursday September 1, 2016. The Class Notes belongs to Phys 222 at University of Louisville taught by Dr. Ming Yu in Fall 2016. Since its upload, it has received 8 views. For similar materials see Fundamentals of Physics II in Physics at University of Louisville.

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Date Created: 09/01/16
Week 2 Monday, August 29, 2016 12:03 AM • Charging by rubbing- if you rub glass rod with silk, e- transfer from rod to silk leaves equal + charge on rod..only rubbed area is charged • Polarization: ○ In neutral atoms:center of + charge coincides w/ center of - charge ○ Charged atoms:centers separate from electric force  Causes electric dipole(polarization) ○ Ex) neutral wall w + balloon…+ charged balloon will induce - charge on insulator(wall) • Coulomb's law- electric force has following properties: ○ Directed along line joining 2 charged particles ○ Inversely proportional to square of separation distance (r) btwn them Proportionalto product of mags of charges q1 and q2 on the particles Attractive- when charges are opp signs Repulsive- charges have same signs (Same as above w/out - charge) Coulomb's constant: -k =8.9875x10^9 N m /C • Electrostaticforces- electric forces btwn 2 unmoving charges • Magnetic forces- moving charges • Field force- force exerted by one object on another object even tho there is no physical contact btwn them ○ Directs along line connecting 2 bodies ○ Other ex of field force) gravity ○ Electrical v gravitational force Stronger weaker Attractive or repulsive always attractive Both: directed along line btwn 2 particles inverse square laws math form: masses(m1,m2) replaced by charges (q1,q2) G replaced by k • Intxs btwn 2 charges ○ Q1 on q2 ○ Q2 on q1 (forces opp way than in above diagram) …action reaction: 2 like charges(repulsion)… 2 unlike charges (attraction) • Ex) ch 15 #4 …action reaction: 2 like charges(repulsion)… 2 unlike charges (attraction) • Ex) ch 15 #4 • Superposition principle: ○ Number of separate charges act on charge of interest(q1)  Each charge exerts electric force on q1  Resultant force on any one charge equals vector sum of forces exerted by other indiv charges present □ Find electrical forces btwn pairs of charges separately,then add vectors □ Must find both portions and add each then add together Electricity- flow of electric charges… produce EM fields Electric charge- charged particles interacting- generates in atom " current- movementof charged particles " field(E)- EM field- whole space centered at charged obkect Exerts force on charged objects that enter the field Field exists independent of second charged object Produced by source charge Unit: N/C Vector quantity Direction of field is dir of electric force that would be exerted on small pos test charge placed at that point.. Test charge must not cause rearrangementof source charge Electric field produced by neg charge(Q<0) is directed toward the charge, so positivetest charge would attract… if from pos charge(Q>0) test charge would repel " potential- capacity fo EM to do work on electrical charge Electromagnet-electric current generate magnetic fields, and changing field generate current Electric field from 2 point charges: Find x and y components Sum x and y components Use pythagorean to find mag of resultant field Use inverse tan to find dir of resultant field

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