Lecture16 Exam 2 Review

8/3/2019 Lecture16 Exam 2 Review

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http://www.nearing-zero.net(adapted from nz015.jpg)

The Physics 24 graders areready to begin grading.

Pick up test prep HW!


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Exam 2

Review

The fine print: the problems in this lecture are the standard exam reviewlecture problems and are not a guarantee of the exam content. The

contents of this lecture may change at the last minute!

Please Look at Prior Tests!


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Poll

y Next semesters text:

Softcover, like this semester: $124.80 suggested retail.

Or loose pages, 3-hole punch with binder, estimated $86retail.


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Announcements

y Pie your professor, Monday, Oct. 24 (proceeds go to Habitatfor Humanity).

Collection will be available before each lecture, in thedepartment office at other times, outside the library, and inHavener.

Im not worried because I know none of you have the gutsto pie me.


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Announcements

y Pick up test preparation homework from the back of thelecture hall.

y Updated course grades should be available by 3:00 pm,Wednesday, October 19. Grades spreadsheets will not beupdated over the weekends after exams.

y Students NOT taking their exam at the regular time and placereceived an e-mail from me last Friday.


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Know the exam time!

Find your room ahead of time!

If at 5:00 on test day you are lost, go to 104 Physics and check the exam

room schedule, then go to the appropriate room and take the exam there.

Exam is from5:00-6:15 pm!

y Physics 24 Test Room Assignments, Fall 2011:

Instructor Sections Room

Dr. Hagen K, L 295 ToomeyDr. Hale E, G 104 PhysicsDr. Hor J, M 227 FultonDr. Parris B, H 125 Butler-Carlton (Civil)Dr. Peacher D, F G-5 HSSDr. Schmitt A, C 120 Butler-Carlton (Civil)

4:30 and 5:30 Exams 202 PhysicsSpecial Needs Testing Center


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Look at posted prior tests to get an idea of type anddifficulty of exam 2 problems.

Please Look at Prior Tests!

If there are any problems with posted exams or solutions,let me know before exam day, so you have a chance to seecorrections!


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y Reminders:

No external communication allowed while you are in the examroom.

Please do not leave the exam room before 5:30 pm.

No headphones.

Be sure to bring a calculator!


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Whats The Big Idea?

y Energy Stored in Capacitors and Electric Fields, Dielectrics (chapter 24sections 3-4)

y Electric Current and Resistance (chapter 25 sections 1-3)

y EMF, Electric Power (chapter 25 sections 4-5)

y Resistors in Series and Parallel, Kirchoffs Rules (chapter 26 sections 1-2)y Electrical Instruments, RC Circuits (chapter 26 sections 3-4)

y Magnetism, Magnetic Forces, Gauss Law for Magnetism (chapter 27sections 1-4)

yMagnetic Force on Currents,

Torque on a Current Loop (chapter 27sections 5-7)


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HelpfulHints

y Because there is so much material to study:

You will not be required to do a Kirchhoffs rules circuit (butyou may apply the rules to any circuit if you wish).


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Two identical capacitors of capacitance C are connected inseries across a total potential V. A dielectric material with

dielectric constantO is inserted into one of the capacitorscompletely filling the space between its plates.

Calculate the charge on each capacitor, the potential differenceacross each capacitor, and the electric energy stored in each

capacitor after the dielectric is inserted.


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Two charged particles having identical masses and velocitiesenter a region of uniform magnetic field, as shown in the

figure. Particle has a charge Q1 and moves in a circular pathof radius r1=R. Particle has a charge Q2 and moves in acircular path of radius r2=2R. The two paths are shown in thefigure. What is the ratio Q2/Q1?


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For the system of resistors shown below R1=2;, R2=3;,R3=1;, and R4=4;. If V0 = 1V calculate

(a) the equivalent resistance,(b) the current through each resistor, and(c) the power delivered to each resistor.

R1R2 R3

R4

V0


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Capacitors C1 and C2 are connected in an RC circuit as shown.What is the time constant of the circuit??


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In the circuit shown R1=5.0 k;, R2=10 k;, and V = 12.0 V.The capacitor is initially uncharged. After the switch has beenclosed for 1.30 s the potential difference across the capacitoris 5.0 V. (a) Calculate the time constant of the circuit. (b) Findthe value of C. (c) Sketch the current, charge, and potentialdifference across the capacitor as a function of time.

This lecture does not have adischarging capacitor circuit.

Do not ignore the discharging-type problems.


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How todetermine Afor a currentloop.

Curl your fingers along the loop in the direction of the(conventional) current.

Your outstretched thumb points in the direction of A.

By the way, this is the consequence if we catch you using yourleft hand for the right hand rule


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Lecture16 Exam 2 Review

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Transcript of Lecture16 Exam 2 Review