minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic‚ all other substances respond weakly to a magnetic field‚ by one of several other types of magnetism. Every magnet has two poles. This is where most of its magnetic strength is most powerful. These poles are called north and south or north-seeking and south seeking poles. The poles are called this as when a magnet is hung or
Premium Magnet Magnetic field Magnetism
Generators. A generator is a machine that converts mechanical energy into electrical energy by using the principle of magnetic induction. DC generator or direct current generator generates a voltage when speed and flux are met. This machine is called a unidirectional (dynamo).It consists of the same basic elements as a simple AC generator like the multi-turn coil rotating uniformly in a magnetic field .The output of which is a series of emf pulses‚ all in the same positive direction resulting in an average
Premium Electrical generator Magnetic field Electricity
Materials Science Version No. 2.0 Course Prerequisites/ Corequisites/ antirequisites : L T P C 3024 Objectives: To enable the students to understand the nature of different types of materials namely Conducting‚ Semi conducting‚ Dielectrics‚ Magnetic and Superconducting materials. Expected Outcome: This course will be the base to understand the various concepts involved in the applications of materials in Engineering and Technology. Unit 1 Conducting material 10 hours (Description)
Premium Fundamental physics concepts Semiconductor Electron
AUTONOMA DE COAHUILA FACULTAD DE SISTEMAS DC Motors Catedrático: Ing. Gustavo Mendoza Leal Alumno: Alfredo Valdés Cárdenas Introduction A DC motor is a type of electrical machine that converts direct current into mechanical power by means of a magnetic field. DC motors are widely used in field applications because of their many advantages over AC motors such as speed control‚ high starting torque‚ quick starting‚ stopping‚ reverse and acceleration and free from harmonics found in AC. Applications
Premium Electric motor Magnetic field Electromagnetism
WORKSHEET # 3 1. In the magnetic system of the Figure below two sides are thicker than the other two sides. The depth of the core is 10 cm‚ the relative permeability of the core‚ ur = 2000‚ the number of turns N = 500‚ and the current flowing through the coil is i = 1 A. (a) Determine the flux in the core. (b) Determine the flux densities in the parts of the core. (c) Find the current i in the coil to produce a flux (φ=0.012Wb). 2. A circular ring of magnetic material has a mean length
Premium Magnetic field
gas by heating at constant pressure to the boiling point‚ or else by reducing the pressure at constant temperature. Plasma - Like a gas‚ plasma does not have definite shape or volume. Unlike gases‚ plasmas are electrically conductive‚ produce magnetic fields and electric currents‚ and respond strongly to electromagnetic forces. Positively charged nuclei swim in a "sea" of freely-moving disassociated electrons‚ similar to the way such charges exist in conductive metal. In fact it is this electron
Premium Magnetic field Photon
yanmin_jia@yahoo.com.cn‚ Phone: +86 579 8229 8979‚ Fax: +86 579 8229 8188 A passive micro-displacement sensor (for ~ μm displacement) was fabricated based on a magnetoelectric laminate‚ in which the displacement change can result in a change of the magnetic flux around the magnetoelectric sensor. The displacement measurement was realized by measuring the magnetoelectric output voltage. The displacement detecting coefficient was ~ 2.5 mV/μm at a frequency of ~ 1 kHz. This passive displacement sensor
Free Magnetic field Magnetism Electromagnetism
ticker tape timer Aim: To determine a value for the acceleration due to gravity‚ g. Equipment: n ticker tape timer n ticker tape n pulley mass n string n adhesive tape n 30 cm rule n scissors n glue n Introduction As an object falls freely it will accelerate towards the centre of the Earth. This is due to the gravitational attraction between object and the Earth. The magnitude of this acceleration can be determined by analysing the motion of the falling mass with a ticker tape timer.
Premium Magnet Magnetic field Magnetism
cleanly and fast. One of the most important uses for electromagnetism is in electronic motors. The main components are a core rod and many copper wires coiling around the iron rod. The coils rotate around the iron rod because of the magnetic force caused by a certain magnetic field on an electric current. While doing so‚ this turns electrical energy into mechanical energy. When this happens‚ normally a gear is attached to the end of the rod. That Gear is connected to another gear and that can be linked
Premium Magnetic field Electromagnetism Electric current
how much power it must supply‚ whether it will be powered by AC or DC and what reliability is required. The essentials of an electric motor are the supply of electrical energy to a coil in a magnetic field causing it to rotate. The generation of electrical power requires relative motion between a magnetic field and a conductor. In a generator‚ mechanical energy is converted into electrical energy while the opposite occurs in an electric motor. The electricity produced by most generators is
Premium Magnetic field Electromagnetism Alternating current