Electromagnets! An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current. The magnetic field disappears when the current is turned off. Electromagnets are widely used as components of other electrical devices‚ such as motors‚ generators‚ relays‚ loudspeakers‚ hard disks‚ MRI machines‚ scientific instruments‚ and magnetic separation equipment‚ as well as being employed as industrial lifting electromagnets for picking up and moving heavy iron objects
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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
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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)
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answer questions 10× 2 = 20 M Answer all questions‚ each carries two marks. (1) What are beats? (2)Can there be electric intensity at a point with zero electric potential? Give example. (3) define resistivity (or) Specific resistance. (4)Magnetic lines form continuous closed loops. Why? (5)State Lenz’s law. (6)What is transformer ratio? (7)Give two uses of infrared rays. (8) What is work function? (9) Draw the circuit symbol for p – n – p and n - p – n transistors. (10) Define modulation
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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
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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
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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
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Semiconductors: Band Gap of Germanium and the Hall Effect Friday‚ Section 006 TA: Yilikal Ayino John Greavu with Daniel Erickson & Kevin Haar February 14‚ 2014 PreLab With the new understanding of quantum mechanics and solid-state physics in the 1930’s came the development of semiconductors. Semiconductors are materials such as silicon and germanium in which the current density is non-zero‚ unlike an insulator‚ yet still several magnitudes smaller than that of a conductor. There exists a significant
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storms or instrument error‚ believers explain the incidences as the acts of evil extraterrestrials‚ residue crystals from Atlantis‚ magnetic fields‚ or methane gas. The easiest way that the Bermuda Triangle can be disproven is by investigating the assumptions of the believers. Some of the explanations for the Bermuda Triangle seem to be scientific in nature. The magnetic disturbance and methane gas explanations both use scientific language in order to assert the claims. The theories are not substantiated
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electricity and voice-coil speakers can also act as microphones. ------------------------------------------------- Applications Electromagnetic: * Antenna – converts propagating electromagnetic waves to and from conducted electrical signals * Magnetic cartridge – converts relative physical motion to and from electrical signals * Tape head‚ Disk read-and-write head -
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