Going over Friday’s Quiz

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Presentation transcript:

Going over Friday’s Quiz

Announcement Absent on Thursday for Certification Exam Two homework assignments due Friday: Electrostatic Force + Electric Field Quiz on Friday on Objectives 6-10 (inspired by homework questions)

Electrical Forces 4.1.3 Coulomb’s Law

Opposite charges ATTRACT Electrostatic Force Same charges REPEL + + Opposite charges ATTRACT - +

Electrostatic Force r q1 q2 Amount of force depends on: Fe r CHARGE ON EACH OBJECT DISTANCE BETWEEN OBJECTS ELECTROSTATIC CONSTANT: k = 8.99 x 109 N·m2/C2 q1 q2 Fe r r

Electrostatic vs. Gravitational Force Consider two electrons that are 1.0 micrometer apart. Gravitationally ATTRACTED Electrostatically REPELLED Fe e- e- Fg r = 1.0 μm 5.54 x 10-59 N 2.30 x 10-16 N

Example #1 Determine the electrostatic force between an object with a +2.0 coulomb charge and an object with a -2.0 coulomb charge if they are separated by 2.0 meters. ATTRACTIVE

Example #2 Determine the electrostatic force between an object with -2.0 micro-coulombs of charge and an object with -5.0 micro-coulombs of charge if they are separated by 5.0 nanometers. REPULSIVE

1. When two spheres, each with charge Q are positioned a distance R apart, they are attracted to one another by a force of magnitude F. What force would they be attracted by if… a) one of the charges is tripled while the other is doubled? b) the separation distance is changed to 3R? c) one of the charges is changed to Q/2? d) one of the charges is doubled and the separation distance is R/2? 2) If two charged objects are attracted to one another by an electrostatic force of 5.0 Newtons, what force would they be attracted by if the charge on both of them were doubled?

1. When two spheres, each with charge Q are positioned a distance R apart, they are attracted to one another by a force of magnitude F. What force would they be attracted by if… a) one of the charges is tripled while the other is doubled? 6F b) the separation distance is changed to 3R? F/9 c) one of the charges is changed to Q/2? F/2 d) one of the charges is doubled and the separation distance is R/2? F/2 2) If two charged objects are attracted to one another by an electrostatic force of 5.0 Newtons, what force would they be attracted by if the charge on both of them were doubled? 20N