PPT-Electric Force and Fields

By Raiden Foris The attractive or repulsive interaction between any two charged objects is an electric force video What is electric force Coulombs law The symbol k is a proportionality constant known as the Coulombs law constant The value of this constant is dependent upon the medium that the charged objects are immersed in In the case of air the value is approximately 90 x 109 N m2 C2 . In addition magnetic fields create a force only on moving charges The direction the magnetic field produced by a moving charge is perpendicular to the direction of motion The direction of the force due to a magnetic field is perpendicular to the dir Physics 2415 Lecture 3. Michael Fowler, UVa. Today’s Topics. Continuous charge distributions: line of charge. Visualizing the field: lines of force. Electron moving in a field. Electric dipoles. Superposition. The Origin of Electricity. The electrical nature of matter comes from atomic structure. Nucleus. – . made up of . protons. and . neutrons. Most of the mass of the atom is contained in the nucleus. Cyberworld. November. 2014. Sandrine Ammann. Marketing & Communications Officer. Agenda. Latest developments. Complex . queries. Search syntax. Field code. Examples. CLIR. “Wrap-up” example. Q&A session. Magnetic fields . Physics 2102. Gabriela Gonz. á. lez. L. Magnetic force on a wire. L. Note: If wire is not straight,. compute force on differential elements and integrate:. Example. By symmetry, F. Electric fields are created by . electric charges. . Any object with a charge has an electric field around it. Opposite charges attract each other; like charges repel. An electric field is a region in which a charge experiences a force. . Contents:. Basic Concept. Calculating electric Field example. Whiteboards. Point Charges. Examples. Whiteboards. Electric Fields in Charge Arrays. Force on mass Force on charge. g = Field strength E = Field strength. 3.1 . Electric Charges, Fields, and Potentials . 3.2 . Capacitance . 3.2.1 . Capacitor . 3.2.2 . Dielectric Constant . 3.3 Magnetism . 3.3.1 . Faraday’s . Law. 3.3.2 Solenoid. 3.3.3 . Toroid. 3.3.4 Permanent . Anna (. Ania. ) . Malanushenko. Force-Free Fields. Know . B. in photosphere. Want to know . B. in the corona. Force-free field: definition. Recall from the prev. lecture: . neglect in the corona. Equilibrium. 21. History of Magnetism . In 1269, Pierre de Maricourt of France found that the directions of a needle near a spherical natural magnet formed lines that encircled the sphere and passed through two points diametrically opposite each other, which he called the poles of the magnet. Subsequent experiments showed that every magnet, regardless of its shape, has two poles, called North (N) and (S) poles, that exert forces on other magnetic poles similar to the way electric charges exert forces on one another. That is, like poles (N-N or S-S) repel each other, and opposite poles (N-S) attract each other. 18.1 . The Origin of Electricity. The electrical nature of matter is inherent. in atomic structure.. coulombs. 18.1 . The Origin of Electricity. In nature, atoms are normally. found with equal numbers of protons. . Electric Potential (Energy). Charges. The fundamental rule at the base of all electrical phenomena is that . like charges repel and opposite charges attract. An object that has unequal numbers of electrons and protons is . Physicists have identified four fundamental forces that account for the account all phenomena in the universe. .* . Force. Strength. Distance of action. Description. Strong nuclear. Very. strong!. Very, very Short. Defining the Electric Field. Michael Faraday suggested the idea of a force field to explain how the electric force can act at a distance.. An . electric field . is a property of the space around a charged object that exerts forces on other charged objects. .