SP212 Exam 2 Review Guide (Chapters 27-30.5, Lessons 15-28)
a) Exam format: 50 minutes by design, get the lab period. Will be 11 problems and I will drop the low problem so
you can try all of them. Each problem will either be a short answer problem or a numeric/symbolic calculation.
About six of the questions should be REALLY easy. The other five are on the difficulty level of homework
problems/quiz problems.
b) Exam procedure: You are given a course equation sheet attached to the exam. You can have a calculator, which
should be the issue calculator.
c) Concepts with which you should be familiar. By familiar what I mean is that when you see each of these items
you can say “Oh yeah, that means…..” If you think you can describe it you have likely learned it to my satisfaction.
If I talk about being able to do a particular calculation, make sure you know how to do it!
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How is current related to charge in a circuit?
Ohm’s law including a microscopic idea of what is going on with the electrons. Why is V=iR?
What is the difference between an ohmic and non-ohmic material?
Drift speed and current density as well as resistivity/conductivity of a metal.
Calculating the resistance of a device from its shape and composition and how it will change with temperature.
What is EMF?
Be able to apply Kirchoff’s rules to a circuit with a single EMF in it.
In Kirchoff’s rules, what do the junction and loop rules represent?
Recognize circuit elements on a circuit diagram.
Energy and Power use in circuits comprised of resistors and batteries.
Know what a kilowatt hour is.
Internal resistance of a battery.
Resistors in series and parallel.
Forming multiple equations in multiple unknowns and solving them for circuits using Kirchoff’s rules.
How many Joules are in an electron-Volt? How do we know that? (hint: Unit of energy)
Why is the resistance of an Ammeter low? Why is the resistance of a voltmeter high?
What are RC circuits and how to do the charging/discharging equations lead to equations regarding the voltage,
current and energy on BOTH the resistor and capacitor.
What is a magnetic field? What are its units?
Use the Biot-Savart equation to find B caused by isolated moving charges.
Use the Biot-Savart equation to find B caused by moving currents.
Be familiar with all three right hand rules for magnetic field vectors.
Be able to work with magnets and current loops as “magnetic dipoles.”
Define and work with both the magnetic dipole moment and the magnetic dipole’s electric field.
Define what a line integral is.
Discuss what Ampere’s law means for the creation of a magnetic field (what causes it?)
Be able to work simple Ampere’s law problems to get the B field from a line of current or a solenoid.
Work with magnetic fields of solenoids (structure, strength and direction of B fields inside and out).
Be able to calculate the magnetic force on moving charges in B field including direction and magnitude.
Explain what the cyclotron frequency is and how to use it to find the period.
Explain why the natural trajectory for a charged particle in a magnetic field is a circle and how we can calculate the
radius of the orbit (Equation 29.20).
Calculate the magnetic forces between pairs of current carrying wires and the force on single wires in B fields.
Calculate the torque and potential energies for magnetic dipoles placed in B fields.
Explain the principles of operation of an electric motor.
Explain the difference between magnetic and non-magnetic materials.
What is motional EMF and its associated induced current and power?
What is magnetic flux?
What is Faraday’s Law?
In what three ways can a magnetic flux change (in other words, when you take the time derivative of the flux, what
three time dependent variables could appear in the resulting chain rule?)
What is Lenz’s Law (the way to derive the direction of the induced current without having to use vector calc)?
Do various Lenz’s and Faraday’s law problems.