By: Engr. Hinesh Kumar Lecturer IBT , LUMHS

Slides:



Advertisements
Similar presentations
Chapter 21 Electric Charge and Electric Field. Charles Allison © 2000 Question An  particle with a charge +2e and a mass of 4m p is on a collision course.
Advertisements

Coulomb’s Law. Coulomb’s Law… = the relationship among electrical forces, charges, and distance. It is like Newton’s law of gravity. But, unlike gravity,
Day 2 Electrical Charging & Coulomb’s Law. Objectives Charging by Conduction Charging by Induction Electroscopes Coulomb’s Law.
Chapter 23 Electric Fields
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. Objectives Describe the historical development of the concepts of electromagnetic force. Describe and calculate how the magnitude of the.
Coulomb’s Law Physics 102 Professor Lee Carkner Lecture 10.
Dr. Jie ZouPHY Chapter 23 Electric fields (cont.)
Electric Forces Physics A Static #3.
 The gravitational force between two masses, m1 & m2 is proportional to the product of the masses and inversely proportional to the square of the distance.
by Vandana Bathla and Magda Constantinescu
Voltage in Electrical Systems
Coulomb's Law Lesson 2.
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.
Chapter 32 Electrostatics.
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.
The effect of charge and distance on electric force
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.
Topic 6: Fields and Forces 6.1 Gravitational force and field.
Electric Charge and Electric Field
Forces and Fields Lesson 4
Section 23.3: Coulomb’s Law
Electric Fields Chapter What do you already know about charged particles? Like charges repel. Opposite charges attract. Electric charges exert a.
Electrical Forces Coulomb’s Law. Same charges REPEL + + Opposite charges ATTRACT + - Electrostatic Force.
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.
Coulomb’s Law Pg
REVISION ELECTROSTATICS. The magnitude of the electrostatic force exerted by one point charge (Q1) on another point charge (Q2) is directly proportional.
Electromagnetism-1 (Electric Charge and Coulomb’s Law) by Dr. Adam A. Bahishti.
Charles Allison © 2000 Chapter 21, Electric Charge, and electric Field.
Electric Force & Coulomb’s Law
Physics 2102 Lecture 04: WED 03 SEP
Coulomb’s Law.
Electric Force Holt: Chapter 17-2 Pages
Coulomb's Law Outcomes You will explain, qualitatively, the principles pertinent to Coulomb’s torsion balance Experiment You will apply Coulomb’s.
Electrostatics Getting a Charge Out of Physics
Radial Electric Fields
COULOMB’S LAW Coulomb’s Law – charges exert forces on each other and have been shown to be directly proportional to the magnitude of the charge and inversely.
COULOMB’S LAW The force between two charged objects is
Electric Force Unit 7.3.
Electric Fields Chapter 14.1.
Coulomb’s Law.
Coulomb’s Law.
Going over Friday’s Quiz
Coulomb’s Law Section
Coulomb’s Law Pg
Physics 133 electromagnetism
32.3 Coulomb’s Law Coulomb’s law states that for charged particles or objects that are small compared with the distance between them, the force between.
Physics 16/21 electromagnetism
Electric Forces and Electric Fields
Section 23.3: Coulomb’s Law
Section 2 Electric Force
Coulomb’s Law.
21.1 Electric forces Electric forces are created between all electric charges. Because there are two kinds of charge (positive and negative) the electrical.
Coulomb’s Law Problems
Coulomb’s Law.
Law of universal gravitation
Electric Charge and Electric Field
ELECTRIC FIELD INTENSITY
REVISION ELECTROSTATICS.
Universal Gravitation
Electric Charge and Coulomb’s Law
Charge & Coulomb’s Law
Coulomb Law.
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.
Force and Electric Fields
Electrical Charge and Coulomb’s Law of Electrostatic Force
Coulombs Law.
Physics 122B Electricity and Magnetism
Electric Force Holt: Chapter 17-2 Pages
Electric Force Unit 11.2.
Presentation transcript:

By: Engr. Hinesh Kumar Lecturer IBT , LUMHS Coulomb’s Law By: Engr. Hinesh Kumar Lecturer IBT , LUMHS

History First experiment to investigate quantitative law of forces between localized charges was out by Charles Augustin Coulomb (French scientist). The results of experiment can be stated the form of a law called Coulomb’s Law.

Coulomb’s Law The interaction force between two charges is: directly proportional to the size of each charge (q1 and q2)

Coulomb’s Law q2 q1 r F The interaction force between two charges is: inversely proportional to the square of their Separation distance (d) F q2 q1 r

Coulomb’s Law k = Coulomb’s Constant = 9.0x109 Nm2/C2 q1 = charge on mass 1 q2 = charge on mass 2 r = the distance between the two charges e0 = permitivity of free space

Coulomb’s Law in Vector q1 q2 F12 r12 r12 Where is the force F12 exerted by q1 on q2 and r12 is the unit vector along the line joining the two charges from q1 to q2. The magnitude as well as the direction of force can be represented by the vector equation

Coulomb's Law The force between charges is directly proportional to the magnitude, or amount, of each charge. Doubling one charge doubles the force. Doubling both charges quadruples the force.

Coulomb's Law The force between charges is inversely proportional to the square of the distance between them. Doubling the distance reduces the force by a factor of 22 = (4), decreasing the force to one-fourth its original value (1/4). This relationship is called an inverse square law because force and distance follow an inverse square relationship.

Inverse Square Law It is state that a physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity. In equation form:

Coulomb’s Vs Newton Look carefully at the Coulomb’s Law equation This equation looks very much like Newton’s Law of Universal Gravitation! Gravitational force concerns MASS Coulomb force is about CHARGE Both have an INVERSE SQUARE relationship between FORCE and DISTANCE

A negative answer shows that the Example # 1 What is the electrostatic force between these two objects? r = 2.0 m q1 = -2C q2 = +2C A negative answer shows that the force is ATTRACTIVE

A positive answer shows that the Example # 2 What is the electrostatic force between these two objects? r = 5 nm q1 = -5μC q2 = -2μC A positive answer shows that the force is REPULSIVE

Problem # 1 Two 40 gram masses each with a charge of 3μC are placed 50cm apart. Compare the gravitational force between the two masses to the electric force between the two masses. 3μC 40g 50cm

Problem # 2 Three charged objects are placed as shown. Find the net force on the object with the charge of -4μC. -5μC 20cm 45º F1 5μC - 4μC F2

Applications Coulomb’s law is employed in meteorology to test models of thunderstorm charge distributions. Atmospheric physics, planetary physics, astrophysics, and plasma physics are vast domains of application of coulomb’s law. Another application of Coulomb's law is in the study of crystal structure. Crystals are made of charged particles called ions.

Applications Ions arrange themselves in any particular crystal (such as a crystal of sodium chloride, or table salt) so that electrical forces are balanced. By studying these forces, mineralogists can better understand the nature of specific crystal structures.

Questions..!!!

Facts are many but Truth is One… (Rabirnath Tagore)