PHYS1120 Exam III review
Things to remember for PHYS1110: algebra, trig (sin, cos, ..)
vector math, especially vector addition, Fnet = ma problems, free-body diagrams
Exam1 and Exam2 Material : E-fields, Gauss's Law, voltage, capacitors, circuits.
Last part of Chapter 26 : RC circuits
? Voltage across a capacitor is always
? An uncharged capacitor has ΔV= 0 , acts like a wire, as short (does not resist the flow of current).
? A fully charged capacitor has I = 0, acts like an open switch.
? time constant is
Ch. 27 Magnetic fields
? This is the definition of B .
? When both E-field and B-field are present:
? Motion of charge in magnetic field and in velocity selector.
? force and torque on a current loop
Ch. 28 Sources of Magnetic fields
? Currents cause magnetic fields (B-fields)
? Biot-Savart Law: (Know what all the symbols mean)
? Ampere's Law:
Be able to use Ampere to derive
? B-field outside long straight wire:
? B-field inside long wire of radius R:
? B-field inside solenoid:
(No need to memorize these formulas; know how to derive them)
? "right-hand rule 2": point thumb in direction of straight thing, fingers curl in sense of circular thing.
? B-field is a vector:
? parallel currents attract; anti-parallel currents repel
? Gauss's Law for B-fields: Magnetic monopoles do not exist.
? field of a solenoid, permanent magnet acts like solenoid
Ch. 29 Faraday's Law
? Faraday's Law: An emf (= battery voltage) is caused by a changing magnetic flux:
magnetic flux
Be able to use Faraday's Law to derive E-field inside or outside a solenoid.
? Lenz's Law: Iinduced creates Binduced in direction that opposes the change in flux.
? Motors and generators
? Eddy current forces always oppose the motion
To prepare for any exam:
? Study my online lecture Notes.
? Review Concept Tests, MP problems, and Tutorial HW. (Read question and try to remember reasoning that gets to the answer)
? Prepare your formula sheet. Prioritize: which are the important equations?
? Take the practice exam.
? It is no good to memorize answers. You have to understand and remember how you got the answers.
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