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

Physics 2- PHYS 1302 Week One Notes Chapter 19

by: Alexis Clowtis

Physics 2- PHYS 1302 Week One Notes Chapter 19 PHYS 1302

Marketplace > University of Houston > Physics 2 > PHYS 1302 > Physics 2 PHYS 1302 Week One Notes Chapter 19
Alexis Clowtis
GPA 4.0
View Full Document for 0 Karma

View Full Document


Unlock These Notes for FREE

Enter your email below and we will instantly email you these Notes for introduction to physics

(Limited time offer)

Unlock Notes

Already have a StudySoup account? Login here

Unlock FREE Class Notes

Enter your email below to receive introduction to physics notes

Everyone needs better class notes. Enter your email and we will send you notes for this class for free.

Unlock FREE notes

About this Document

These notes cover the first day of class which is half of Chapter 19: Electric Charges, Forces, and Fields. This set of notes covers through electric field lines.
introduction to physics
Mini Das
Class Notes
Physics, electric field, forces, Charge




Popular in introduction to physics

Popular in Physics 2

This 5 page Class Notes was uploaded by Alexis Clowtis on Wednesday February 3, 2016. The Class Notes belongs to PHYS 1302 at University of Houston taught by Mini Das in Spring 2016. Since its upload, it has received 103 views. For similar materials see introduction to physics in Physics 2 at University of Houston.


Reviews for Physics 2- PHYS 1302 Week One Notes Chapter 19


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: 02/03/16
Physics 1302- 1pm MW SR1 116 Professor Mini Das Chapter 19 1/20/2016 19-1 Static Electricty Normally things have a neutral charge when charged=force Like charges repel, opposites attract Magnitude of electron’s charge is the same as proton’s Induced charge- charged rod picking up attached pieces of tissue (tissue is neutral) Total electric charge of the universe is constant Conductor- induce charge into metal, it flows through metal Insulator- plastic rod charged in one place, doesn’t move Stay away from each other farthest spread at surface = induction Charge stays on surface of conductor because same charge so repel each other Coulomb’s Law ???? = ???? |????1|????2| Units: Newtons (N) ???? 9  K= constant=8.99 X 10 N  q= charge Units: Coulombs (C)  r=distance Example: Force on q1 by q2 is in the positive x direction Q1= 1C Q2= -10 C F=10K 19-3 Coulomb’s Law If multiple point charges, forces add by superposition Forces of charges as vector sum, figure out overall direction and magnitude of force From professor’s slides Physics 1302- 1pm MW SR1 116 Professor Mini Das 19-4 Electric Field Electric field has a direction ⃗ ???? ???? = ????0 Units: Newton/Coulomb (N/C) If only 1 charge in a neutral area, no force. 2ndcharge introduced and it’s a field qois a positive “test charge”- serves to allow electric force to be measured ???? ????| ???? = ????2 ???? = ????????⃗ Direction of force depends on sign of charge 19.5 Electric Field Lines “If I put a test positive charge here, which way will it move?” -Direction which positive test charge would move (AWAY from positive charge in 3D) What happens to the test positive charge is the direction of the electric field lines *Always start in a positive charge and end in a negative charge* Field lines are straight in capacitors Example -Both are positive -Density of field lines tell magnitude of force -Density of field lines are greater closer to the charge -Force due to charge gets smaller as you move away because r 2 increases, F decreases Physics 1302- 1pm MW SR1 116 Professor Mini Das Conceptual Checkpoint 19-2 F=ma  smaller mass accelerates more, meet closer to proton because the electron moves faster  B is the answer Conceptual checkpoint 19-3 FnetA<F netB F 1xd F can2xl but F +F =R1yres2ytayt) R=0 at A Conceptual checkpoint 19-4 Enet at point P is upward Magnitude of q =1agnitude of q so 2oth of them identified as just q The difference in the two is the sign The electric field tells what a positive test charge would do if you put it at P (no charge at P) Answer: B q1 is negative, q2 is positive because that is the only way a positive test charge would go straight up at P Physics 1302- 1pm MW SR1 116 Professor Mini Das DIY Example 19-5 Need to find E1 and E2 first 9 −6 ???? = ???????? = (8.99????10 )(2.9????10 ) = 52142 = 5.21????10 ????/???? 1 (√2????) 2 2(.5 ) 9 −6 ???????? (8.99????10 )(2.9????10 ) 5 ????2= (????)2= (.5 ) = 104284 = 1.04????10 ????/???? Then to find the resultant of the two, find the components of each and add them using the rules of vector addition. E2 is only in the x direction, so there is no y component. ???? = ???? cos45 = 36840 1???? 1 ????1???? = ????1sin45 = 36840 ???? 2????= ????2 5 5 ???? ???? 36840 + 1.04????10 = 1.41????10 ???????? ????ℎ???? ???? ???????????????????????????????????? ????????= 36840 ???????? ????ℎ???? ???? ???????????????????????????????????? 1.46????10 ???? ???? = √( 1.41????105)2+ 36840 = 145578.7 = ???????????? ???? ???????? 36840 ???? = tan1 = tan−1( ) = 14.67° ???????? 140840 Physics 1302- 1pm MW SR1 116 Professor Mini Das Professor’s Example Find the net force on q3. q1= -5.4 µC q2= -2.2 µC q3= +1.6 µC ???????? ???? (8.99????10 )(1.6????10 ????)(5.4????10 ????)−6 ????1= 1 3 = = −0.14???? ????̂ ????2 0.752 ????????2 3 (8.99????10 )(1.6????10 ????)(2.2????10 ????) −6 ????2= 2 = 2 = 0.51???? ????̂ ???? 0.25 Fnet +1 =0251N-0.14N= +0.37N in the positive x direction Key Values: -31 Mass of an electron= 9.11x10 kg Mass of a proton= 1.673x10 -2kg Mass of a neutron= 1.675x10 -27kg -19 Magnitude of an Electron’s charge= 1.60x10 C


Buy Material

Are you sure you want to buy this material for

0 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

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Kyle Maynard Purdue

"When you're taking detailed notes and trying to help everyone else out in the class, it really helps you learn and understand the I made $280 on my first study guide!"

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

Parker Thompson 500 Startups

"It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

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.