Electric Field Strength. EFS (by definition)  The electric field strength, E, is the force, F elec, per unit charge, q, at a point. The equation for.

Slides:



Advertisements
Similar presentations
Magnetic Fields & Magnetic Field Strength We have seen that magnets can exert a force on objects without touching them. For this reason we speak of a.
Advertisements

TOC 1 Physics 212 Electric Force Dependence on Amount of Charge Dependence on Distance Magnitude of the Coulomb Force Direction of the Coulomb Force Coulomb.
Electric Forces and Electric Fields. Properties of Electric Charges Two types of charges exist They are called positive and negative Named by Benjamin.
In this section you will:
Nadiah Alenazi 1 Chapter 23 Electric Fields 23.1 Properties of Electric Charges 23.3 Coulomb ’ s Law 23.4 The Electric Field 23.6 Electric Field Lines.
Coulomb’s Law. Electric Force  Two positively charged spheres will repel each other.  The force will cause a deflection until equilibrium is reached.
Charge Coulomb’s Law 1 TOC Dependence on Amount of Charge Dependence on Distance Magnitude of the Coulomb Force Direction of the Coulomb Force Coulomb.
Electric Fields Electric fields are created by electric charges. Any object with a charge has an electric field around it. Opposite charges attract each.
E LECTRIC F IELD S TRENGTH E LECTRIC F IELD Physicists did not like the concept of “action at a distance” i.e. a force that was “caused” by an object.
Null methods A B is a length of wire C is a moveable contact G is a galvanometer E is a source of emf.
Electrostatic Force Coulomb’s Law. Charges Two charges of the same type repel one another ++ The two charges will experience a FORCE pushing them apart.
●Define an electric field. ●Solve problems relating to charge, electric fields, and forces. ●Diagram electric field lines. In this section you will: Section.
Lecture 3 Electric Field Electric Field Lines Conductors in Electrostatic Equilibrium Millikan’s Oil-Drop Experiment Van de Graff Generator Electric Flux.
Chapter 18 Electric Forces and Electric Fields The Origin of Electricity The electrical nature of matter is inherent in atomic structure. coulombs.
Electric Charge O All ordinary matter contains both positive and negative charge. O You do not usually notice the charge because most matter contains the.
Electric Charge and Electric Field
ELEC 3105 Lecture 1 Coulomb. 4. Electrostatics Applied EM by Ulaby, Michielssen and Ravaioli.
Chapter 18 Summary Essential Concepts and Formulas.
Electrostatics. Electric force is given by the formula above. k=9.0*10 9 (N*m 2 /C 2 ) C is the unit for charge, the Coulomb(Coo-Lome) Like charges repel.
● An electric field exists around any charged object. The field produces forces on other charged objects. ● The electric field is the force per unit charge.
ELECTRIC CHARGE property of matter that creates electric and magnetic forces and interactions. depends on the imbalance of its protons and electrons. Electrons.
Electrostatic Forces Homework: Complete handout. Magnitude of Force According to Coulomb’s Law  The magnitude of force exerted on a charge by another.
The effect of charge and distance on electric force
Coulomb’s Law. Electric Force Symbol: F el Symbol: F el Definition: the attractive or repulsive force between any 2 charged objects. Definition: the attractive.
Electric Charge and Electric Field
Topic 6: Fields and Forces 6.1 Gravitational force and field.
Forces and Fields Lesson 4
Key Points Potential is Inversely Proportional to distance Electric Field Strength is Proportional to the Inverse Square of the distance Equipotentials.
Coulomb’s Law p. 538 in your book. Charged objects & electrical force Two electrically charged objects exert a force on each other. Opposite charges ATTRACT.
Electrostatic.
Coulomb’s Law Electrostatic Force.
Electricity.
17.2 and 17.3 Electric Forces and Fields pp Mr. Richter.
Electrostatic Forces and Electric Fields Your Guide to the Universe.
REVISION ELECTROSTATICS. The magnitude of the electrostatic force exerted by one point charge (Q1) on another point charge (Q2) is directly proportional.
Newton’s Fourth Law Universal Gravitation UniversalUniversal Universal Gravitation.
Laws of Electric Charges. Electric Charge – electric charges exert forces on each other even when they are not in direct contact.
Week 1 - S2 Feb. 15 – 20, 2016 Fields 4.1.Electric Fields
Electric Fields Aim: How do charged objects exert a force on each other?
AQA Physics Gravitational Fields, Electric Fields and Capacitance Section 4 Electric Fields.
Charge (q) Comes in + and – Is conserved total charge remains constant Is quantized elementary charge, e, is charge on 1 electron or 1 proton e =
IB Physics 5.1 Electric Force and the Electric Field
Electric Force Holt: Chapter 17-2 Pages
Physics Section 16.2 Apply Coulomb’s Law
Electrostatics Getting a Charge Out of Physics
ELEC 3105 Lecture 1 Coulomb.
Electric Fields.
COULOMB’S LAW The force between two charged objects is
Electric Force Unit 7.3.
DEFINITIONS: ELECTROSTATICS, ELECTRIC FIELDS and ELECTRIC CIRCUITS
Warm Up No Warm up on Sub days.
2-2-2 Universal Gravitation
Newton’s Law of Gravity
Coulomb’s Law.
Electric Force.
Electric Fields.
Electric Forces and Electric Fields
Electric Field.
Section 2 Electric Force
REVISION ELECTROSTATICS.
Electric Fields Physics Chapter 22 A.
Physics 4 – Nov 6, 2018 Agenda: About Charge Coulomb’s Law
Electric Charge and Coulomb’s Law
Electric Force and Fields
Do Now (and then quiz on Coulomb’s law) Two charges +5C and -8C are placed 4m apart. Calculate the force they exert on each other If you can solve this.
Unit 9 Vocabulary Electrostatics Electrical Force Charge Coulomb’s Law
Coulomb’s Law Every charged particle exerts a force on every other charged particle in the Universe with a force that is proportional to the product of.
Electric Potential.
Electric Force Holt: Chapter 17-2 Pages
Electrostatics Ch. 20.
Presentation transcript:

Electric Field Strength

EFS (by definition)  The electric field strength, E, is the force, F elec, per unit charge, q, at a point. The equation for EFS is (arrows show the units for each symbol) E = F elec q N/C N C

Electric Field Strength  Steps to measure EFS, E, at some point. 1. Place small + test charge (q) at that point 2. Measure the force (F elec ) exerted on the test charge 3. Divide force by the size (amt.) of test charge

Example Problems  If the electric field strength due to some charged object is 1.5E3 N/C, find the force on a positive charge due to 2E-4 C placed in the field.  Known: E = 1.5E3 N/C & q = 2E-4 C  Unknown = F elec  Equation: E = F elec / q (solve for F elec )

Example Problems (cont.) F elec = (1.5E3 N/C) x (2E-4 C) = 0.30 N  If the charge on the object in example #1 was doubled, does that change the electric field strength? Hint: what change would increasing q have on F elec ?

Example Problem (cont.)  Increasing q will increase F elec so ratio between the two is constant.  Conclusion = size of test charge doesn’t effect “E”

EFS Lines of Flux  Directions & Strength of Electric Field (on board)  Facts: 1. More flux lines indicates a stronger electric field 2. Lines of flux should always be drawn so they are perp. to surface of the charge 3. Lines of flux should never cross

Coulomb’s Law Review  Coulomb’s Law: the electric force is directly proportional to the product of their charges and inversely proportional to the square of the distance between their charges. F elec = K x q 1 x q 2 d 2

Coulomb’s Law Review (cont.)  Facts: 1. Increasing the amount of charge will increase the electric force 2. Increasing the distance between the charges will decrease the electric force 3. F elec is + if the 2 charges are alike indicating that they will repel each other 4. F elec is – if the 2 charges are different indicating that they will attract each other