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FIU / Physics / PHY 2054 / How do you find the potential energy of a charge?

How do you find the potential energy of a charge?

How do you find the potential energy of a charge?


School: Florida International University
Department: Physics
Course: Physics without Calculus II
Term: Spring 2015
Cost: 25
Description: These notes cover everything learned from Chapter 18 in the textbook split up in sections. It contains examples worked out with their respective answers and also all the homework problems with their worked solutions. Ps: everything on these notes will be on the exam!
Uploaded: 01/26/2017
8 Pages 118 Views 2 Unlocks

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Chapter 18We also discuss several other topics like When does the Deutsche Bank founded?

Section 18.1 → Electric Potential energy

                                LegendWe also discuss several other topics like What are Florentine examples of architectures?

        ↙   ⤷ displacement                                • K = kinetic energy

      force                                                • U = Potential energy

                                                        • W = workDon't forget about the age old question of cancer critical genes



 when electric fields are taken into account, the work becomes We also discuss several other topics like What is the ability or potential to influence others?

W=Eqs (we replace/substitute F with the F from an electric field)


                  ↘↙We also discuss several other topics like What is stoichiometry and how does it relate to chemical reactions?

        In this case, displacement change its (initial - final)

eg. with a ProtonIf you want to learn more check out placenta abreva

                                                                            ☆ W, F, V are all the same



U = decreases (because proton is moving faster and faster)        

If the velocity was inverted (pushing it upwards) the force would still be going downwards

eg. with an Electron

  ☆        Do not square the denominator in U ☆

Potential Energy of Point Charges


Section 18.2 Potential

▶ Electric Potential (Voltage): the electric potential at any point in an electric field is the

electric potential energy “U” per unit charge with a test

charge “”        



                                Potential energy of (a) with respect to (b) (b being the initial point)

Potential Energy of appoint charge(s)

        For more than one charge =


Section 18.3 Equipotential surfaces

☆ Within this line all UB equal ☆

                                        The equipotential surfaces are always perpendicular to

                                        electrical field lines

• Potential energy at that point

→ Electrical Field lines

Potential Gradient        

                V → Voltage        

S → Displacement

Section 18.4 Capacitors

▶ Capacitor: Device that stores electric potential energy and electric charge consisting of any two conductors separated by vacuum or an insulating material

Symbols in a circuit → ⊣⊢                        

    (of a capacitor)         ⊣(-                                                

                                                                ▶ Surface charge density ()

The electric field in the region between the plates is directly proportional to the electric charge per unit area of the plate

▶ Capacitance: the ratio of the magnitude of the charge “Q” on either conductor to the magnitude of the “” between conductors.


                units=farad (F)

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