Good Luck!

Exam 1 ReviewPhys 222 – Supplemental InstructionTUESDAY SESSION AS NORMAL – Q AND A

THURSDAY SESSION CANCELLED TO ACCOMMODATE EXAM REVIEW

Exam Overview

About 1/3 of the problems will stress conceptual understanding Don’t waste too much time on these Think carefully!

Remaining 2/3 will be numerical problems to test ability to apply these concepts Know your formula sheet Rule out wrong answers

25 + 2 Questions, 2 hours (4.4 minutes/problem)

Prepare yourself

Practice Problems!! Practice tests (11 of them, with solutions)

It’s really easy to think you understand a concept, but then find out you can’t solve a problem on it.

If you miss a problem, read the solution, then do it again later without the solution.

Old quizzes (make sure you understand mistakes)

Book problems (have answers in the back)

SI worksheets

Recitation problems

Concepts Textbook

Online Summaries

Lecture Slides

Do you know all the following?

Fluid StaticsDensity, pressureBuoyancy, surface tension

Archimedes' PrincipalFluid dynamics

Bernoulli’s equationPascal’s law, continuity equationLaminar flow

Electric ChargeCoulomb’s lawCharged objects’ behaviorConductors, Insulators, Polarization

Electric Charge InteractionElectric field, field linesDipoles, dipole momentFlux

Integral RepresentationGaussian RepresentationApplying Gaussian surfaces to objects

Electric Potential(vs) Electric Potential EnergyEquipotential Diagrams

Calculating potential at various pointsMovement of charge in the presence of a

potential.Relation to other types of energy

CapacitanceHow various changes affect capacitanceWhat are their usesConnections in circuits

Parallel vs seriesEquivalent capacitance

Dielectric additionsCurrent

Relation to other conceptsResistance

Connections, much like capacitors

Here we go!LOTS OF TEST PROBLEMS WITH TIPS SPRINKLED IN

Useful tip

Store variables in your calculator

Fluids!

Pressure = Force/Area (units depend on Area)

Archimedes principals Buoyant force equal to weight of liquid displaced!

Pressure at a depth:

Don’t forget the Po!

𝑃+𝜌𝑔𝑦+12𝜌𝑣2=𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡

Classic problem: calculating velocity of water shooting out of a hole in a container.

If pipe changes diameter, changes in velocity can be related to changes in area with the continuity equation

In the case that the radius of a hole is very small, velocity simplifies

y is the depth at the hole

Electric Force

Electric Field

Electric Potential Energy

Electric Potential

Difference (voltage)

Divide by q

Field descriptions: Do not depend on recipient particle/charge.

Recipient charge -- q

Forces and energy: Do depend on recipient and emanating charge.

Emanating charge -- Q

Field lines!

Electric field lines go from + to -

Electric field lines end at negative charges.

Line density indicates field strength

Dipoles

(dipole moment) !! Notice: Dipole moment points from negative

to positive….opposite of the direction E points

Dipole Moment and Torque

𝝉 = ×𝒑 𝑬Know right hand rule for cross products!

This will help you eliminate wrong choices

Note that E is not the E produced by dipole. E is external

Torque minimums and maximumsMax when p perpendicular to E

U = -p E

Steps in solving GL Problems

Draw a picture. Pick a good Gaussian surface. Symmetry!

Write expression of integral flux notation. (if E || A then, EA)

Write expression for Gauss’s Law involving enclosed charge.

Set the expressions equal and eliminate variables to solve.

Capacitance and Energy

Wait, why are there three equations? If asked to calculate U, just use the one that has known

variables

If asked what happens to U when you double, half, etc. If the capacitors are stand alone, use Q^2 equation

If the capacitors are connected to constant voltage use V^2 equation

Combining components

Capacitors Resistors

AdditionT = X1 + X2 +…

Inverse Addition1/T = 1/X1 + 1/X2

+…

AdditionT = X1 + X2 +…

Inverse Addition1/T = 1/X1 + 1/X2

+…

Parallel

Series

HodgepodgeOF RELEVANT QUESTIONS