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Electrostatics

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**Electrostatics Fe >> Fg Electrostatic Force (Fe)**

- Study of electricity at rest Electrostatic Force (Fe) Attractive OR Repulsive Fe = centripetal force keeping e- in orbit Opposite Charges Attract Like Charges Repel Fe >> Fg 99% empty space Electrons – loosely bound Conductors - allow electrons to flow freely (Low e- affinity) Protons & Neutrons – tightly bound in nucleus Nucleus – 99% of atoms mass Gold Atom - few valence electrons loosely bound

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**Insulators - do NOT allow electrons to flow freely**

(High e- affinity)

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Electrostatics - Atomic Structure Conductors Insulators

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**Detecting Charge: Charge Detecting Devices RULES**

Describe Rutherfords findings in his famous Gold Foil Experiment.

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**3 Methods of Charging Separation of Charge Charging by Contact**

Friction Conduction Induction by Grounding Outcome Outcome Outcome

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**Units of Charge: Negative Charge Positive Charge**

Elementary Particles (e) => Coulombs (C) What is the charge in Coulombs for... a) -6e b) +3e Coulombs (C) => Elementary Particles (e) How many extra/fewer e- does object have with charge of... a) -3.2 X10-19C b) 2.0 X10-19C ELECTRON CANNOT BE CUT INTO PIECES!!

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**Conservation of Charge & Charge Transfer:**

2 metal spheres touch then separate… A B What is the charge on each sphere after contact? What subatomic particle(s) were transferred? From where to where? c) How much charge did A gain in elementary particles and Coulombs? d) How much charge did B lose in elementary particles and Coulombs? +4e BEFORE -6e Total Charge = What if? A B AFTER Total Charge =

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**Multistep Charge Transfer**

MicroCoulomb (μC) : a) How many elementary particles? b) How many MicroCoulombs? -5 μC x 1012e Analogy: 325cents. How many Quarters? Analogy: 636eggs. How many dozen? Multistep Charge Transfer Two spheres have charges of +3µC and +7µC respectively... What is the charge on each sphere after contact? How much charge was transferred in.. µC C e q 1. Net Charge = Δq= Δq= 2. Net Charge = 3. Net Charge =

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**Two 1kg charged objects with charges of +2C and -4C are .5m apart…**

Coulombs Law: Two 1kg charged objects with charges of +2C and -4C are .5m apart… What is the electrostatic force (Fe) between the objects? What would be force if charges were +2C and +4C? c) What is the gravitational force (Fg) between the objects? Inverse Square Law Relationships a) 4r b) 2q1 c) 2q1, 3q2 d) 3q1, 3q2, 3r Fe Fe Fe Fe

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**Electric Field - E-Field Intensity/Strength**

Electric Field Lines E-Field vs. G-Field Direction: Rules: What is the electric field strength if a point charge of 2C feels an attractive force of 10N? Given the field strength in part ‘a’, how much force would a proton feels in this field? If the sphere and the point charge are .1m apart, what must be the charge on the sphere?

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Chapter 20 Static Electricity. Objectives Charged Objects Conductors and Insulators Forces on Charged Bodies Coulomb’s Law The unit of charge.

Chapter 20 Static Electricity. Objectives Charged Objects Conductors and Insulators Forces on Charged Bodies Coulomb’s Law The unit of charge.

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