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Tesla Coil - Science Enterprises LLC
Tesla Coil - Science Enterprises LLC

Electric-dipole moments of elementary particles
Electric-dipole moments of elementary particles

... magnets together and thereby changing the magnetic field. However, this effect and many others go as E’ and consequently cancel out on subtracting results with reversed electric fields. A check on the existence of such an E 2 effect can also be obtained from observations at zero electric field. Like ...
EFFECT OF DISORDER IN CUPRATES AND MANGANITES
EFFECT OF DISORDER IN CUPRATES AND MANGANITES

Nuclei, Excitation, Relaxation
Nuclei, Excitation, Relaxation

Laboratório de Plasmas, Instituto de Física, Universidade de
Laboratório de Plasmas, Instituto de Física, Universidade de

... of using an array of permanent magnets, instead of an electromagnet, to produce a radial magnetic field inside the cylindrical plasma drift channel of the thruster is very significant, specially because of the possibility of developing a Hall Thruster with power consumption low enough to be used in ...
PDF only - at www.arxiv.org.
PDF only - at www.arxiv.org.

Document
Document

... Magnetization reversal in thin films and some relevant experimental methods ...
Chapter_26_Halliday_..
Chapter_26_Halliday_..

surface-integral methods of calculating forces on magnetized iron
surface-integral methods of calculating forces on magnetized iron

PhYSiCS
PhYSiCS

Magnetism
Magnetism

Higher Secondary Exam -2011 CRACKER (PHYSICS) BRILLIANT SUCCESS
Higher Secondary Exam -2011 CRACKER (PHYSICS) BRILLIANT SUCCESS

Document
Document

... some deflection in voltmeter but the deflection of ammeter is zero. Explain why? Ans: As the resistance of V is very high so the effective resistance of circuit become very high, so the current flows in circuit is extremely low therefore the deflection is almost zero, while the V measures the potent ...
R - BYU Physics and Astronomy
R - BYU Physics and Astronomy

The mechanical advantage of the magnetosphere
The mechanical advantage of the magnetosphere

Introduction - LPPD - University of Illinois at Chicago
Introduction - LPPD - University of Illinois at Chicago

ENGINEERING ELECTROMAGNETICS NOTES
ENGINEERING ELECTROMAGNETICS NOTES

Investigations of Faraday Rotation Maps of Extended Radio Sources
Investigations of Faraday Rotation Maps of Extended Radio Sources

A Scanning Tunneling Microscope at the Milli-Kelvin, High Magnetic Field Frontier
A Scanning Tunneling Microscope at the Milli-Kelvin, High Magnetic Field Frontier

... and operation of a full-featured, dilution refrigerator-based STM capable of sample preparation in ultra-high vacuum (UHV) and spectroscopic mapping with an electronic temperature of 240 mK in fields up to 14 T. I detail technical solutions to overcome the stringent requirements on vibration isolati ...
1. Introduction - About the journal
1. Introduction - About the journal

... The sensors with back light propagation can be constructed for the birefringence compensation. This approach exploits the non-reciprocity of Faraday effect and the reciprocity of linear birefringence. The light wave is reflected on the far end and its polarization state is rotated with an angle  = ...
Click here to - Kendriya Vidyalaya No.3 AFS Chakeri
Click here to - Kendriya Vidyalaya No.3 AFS Chakeri

... Electrostatics of conductors (i) Inside a conductor Electrostatic field is zero (ii) On the surface E is always Normal (iii) No charge inside the conductor but gets distributed on the surface (iv) Charge distribution on the surface is uniform if the surface is smooth (v) Charge distribution is inver ...
Author`s personal copy
Author`s personal copy

... reduces to the ‘bare’ ANO vortex [5]. The superconducting strings thus comprise a one-parameter family that interpolates between the ‘dressed’ vortex and the ‘bare’ ANO vortex. We construct this family in the opposite direction, by starting from the ‘bare’ vortex and then decreasing its twist. Withi ...
QUANTITATIVE EVALUATIONS OF MECHANISMS OF
QUANTITATIVE EVALUATIONS OF MECHANISMS OF

... in inhomogeneous dielectric structures and at dielectric discontinuities. Nonlinear mechanisms have been proposed to address modulation-dependent effects. Although the time average of any oscillatory field is zero, nonlinear systems respond to the second or higher powers of the field. Although we at ...
The DC Motor
The DC Motor

Class XII- Physics - Kendriya Vidyalaya No.1
Class XII- Physics - Kendriya Vidyalaya No.1

< 1 ... 15 16 17 18 19 20 21 22 23 ... 388 >

Electromagnet



An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.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. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.
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