New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

test 1 summary 222

by: Mary-elizabeth Notetaker

test 1 summary 222 Phys 222

Mary-elizabeth Notetaker
U of L

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Fundamentals of Physics II
Dr. Ming Yu
Study Guide
phys, phys222, fundamentalsofphysics2, UofL
50 ?




Popular in Fundamentals of Physics II

Popular in Physics

This 6 page Study Guide was uploaded by Mary-elizabeth Notetaker on Saturday September 24, 2016. The Study Guide belongs to Phys 222 at University of Louisville taught by Dr. Ming Yu in Fall 2016. Since its upload, it has received 43 views. For similar materials see Fundamentals of Physics II in Physics at University of Louisville.


Reviews for test 1 summary 222


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 09/24/16
e is unit charge... 1.6 X 10 C conductors- electrons move freely in response to electric force and charge distributes evenly ex)copper, aluminum, silver "charging by conduction"- object being charged is always left w same charge as object that did charging induction(no contact) if neg rod touched uncharged sphere, electrons redistribute in sphere if grounded wire is connected, some electrons will leave thru wire if it is removed, sphere will be left w positive charge that will redistribute if rod is then removed, insulators - electrons don't move freely to charge  Coulomb's law- electric force has following properties: o Directed along line joining 2 charged particles o Inversely proportional to square of separation distance (r) btwn them Proportional to product of mags of charges q1 and q2 on the particles  Electrostatic forces- 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 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  Superposition principle: o 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  Electric current- movement of charged particles  " field(E)- EM field- whole space centered at charged object o 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 rearrangement of source charge o Electric field produced by neg charge(Q<0) is directed toward the charge, so positive test charge would attract… if from pos charge(Q>0) test charge would repel o 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  " potential- capacity for EM to do work on electrical charge  If source charge pos, lines radiate outward radically in all dir o If neg, radial lines point inward to infinity o If group of charges, lines start at pos and end at neg o if excess of charge, some lines will begin/end infinitely far away o Number lines drawn leaving pos/ending neg is always same and proportional to mag of charge  2 like charges, lines start at pos and end at infinity…electric field line is tangent to those lines o Bulging out around charges indicated repulsion o Low field lines btwn charges shows weak field in that region o If 2+ with -, only half the lines that leave pos charge will end at neg charge…. 2x number lines leaving +2 as ending on –  Field just outside conductor is perpendicular to conductor's surface  Field accumulates on smallest(sharpest) points so stronger Electric flux: Gauss’s Law Mag of EF everywhere on surface: E flux thru any closed surface is equal to net charge Q inside surface divided by E Flux thru ends is EA , no field thru curved part of surface\ Find field above/below sheet with uniform negative charge per unit area (cylindrical) Same as above: sum top bottom and side. But E will be negative in bottom equation bc field is pointing towards sheet Parallel Plate Capacitor- plates of neg and pos charge w same charge density For pos plate, E field points away from plate at all positions For neg plate, E field points towards plate at all positions Total E field is sum of E+ and E- at all positions Wab=Fconservative x d= -(Peb-Pea)= - PE Work done by conserv force= -change of PE Conserv force PE Where PE: electric PE diff(final-intial) Electric PE- scalar Change od electric PE is independent of path, depends on distance PE(path1)= PE(path2) To obtain electric PE diff: E potential diff( V) btwn 2 points= change in PE of a charge q moved from A to B divided by size of the charge  EP and charge mvmts o When released from rest, pos charges accelerate spontaneously along field direction  Pos charge moves along the field direction…EF does positive work o When released from rest, negative charges accelerate spontaneously opp to field direction  Negative charge moves opp to field dir… E field does pos work  When at rest neg charge goes to dir of lower EP, work must be done by external force against EF  Point of 0 EP is taken to be infinite distance from the charge EP of multiple point charges 1. Diagram all charges(note point of interest) 2. Calc distance from each charge to point of interest 3. Use: V=ke(q/r) a. Include sign b. If potential is pos, charge is pos…same w neg 4. Get algebraic sum If charges have same sign, PE is positive Pos external work must be done to force 2 charges near one another If charges have opp signs, PE is neg Ex work must be done to hold back unlike charges from accelerating as they are brought close together Eqiupotential surfaces- surface on which all points are at same potential V=Vb-Va=0 Wab= - PE=-q V=0 No work needed to move chrge at constant speed on equipot surface Electric field is perpendicular to equipot surface Equipot & EF lines Potential dec along direction of EF lines …dipole If has one pos and one neg,point closer to positive charge has higher potential and it decreases along EF line as you go towards the negative charge …parallel plates If one pos and one neg, points closer to pos have higher potential Electric field does 0 work along path perpendicular to plates Capacitance- quantity characterizing 2 parallel plates conductor and is indep of Q and V Capacitor- used in variety of electrical circuits Capacitance, C, of capacitor is defined as ratio of mag of the charge on either conductor(plate) to the mag of the pot diff btwn the 2 plates Larger area can store more charge so enhances capacitance Small plate separation can dec pot diff and will enhance capacitance Flow stops when V across capacitor = that of battery Capacitors in serier As neg charge accumulates on plates of one group, equivalent amt neg charge is leaving plates of the other group(left w excess pos charge) ..mag of charge must be same on left plate(outer) of C1(group left w pos charge) and right plate(outer) of C2(group accumulating neg charge) For charges on inside plates…: Internal plates connected to each other but not battery so they are electrically neutral. Charges are induced by outside plates in series …Overall, all right plates gain -Q charge and all left plates gain +Q charge Equivalent capacitor can be found that performs same fx as series combo does Battery- transfers charges from one plate to another when connected Stored E is same as work req'd to move charge onto plates done by battery Total work by battery & energy stored Max capacitance, 3 capacitors must be parallel Max pot diff, 2 batteries must be in a series Dielectric- insulating material that inc capacitance when placed btwn 2 plates of a capacitor Rubber, plastic, wax paper Capacitance mult by k(dielectric constant) when dielectric completely fills region btwn 2 plates Polarization- occurs when separation btwn avg positions of neg and pos charge Current direction is along dir pos charges would flow =conventional current dir In common conductor, current is due to net motion of neg charged e-'s Charge carrier- moving charge(+ or -)


Buy Material

Are you sure you want to buy this material for

50 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Allison Fischer University of Alabama

"I signed up to be an Elite Notetaker with 2 of my sorority sisters this semester. We just posted our notes weekly and were each making over $600 per month. I LOVE StudySoup!"

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.