The benefit verses the effect of fetal Magnetic Resonance Imaging has been a controversial subject for years. Magnetic Resonance Imaging is a helpful tool for diagnosis of many diseases and abnormalities‚ but is it actually harmful to the fetus? Do the benefits of the Magnetic Resonance Imaging outweigh the risks? Ultrasound is the mostly commonly used imaging used in pregnancy‚ but in certain cases using fetal Magnetic Resonance Imaging in conjunction with ultrasound is very beneficial in planning
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a changing electric current is surrounded by an associated changing magnetic field‚ which in turn generates a changing electrical current in a conductor placed within it‚ which has its own magnetic field…and so on. It is the electromagnetic equivalent of nesting Matryoshka dolls. Thus‚ in the case of electromagnetic induction‚ placing a conductor in the magnetic field surrounding the first current generates the second current. Electromagnetic induction was discovered independently by Michael Faraday
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Memory “boosted” using Transcranial Magnetic Stimulation (TMS) Researchers at Northwestern University claim to have successfully improved memory functions through the use of transcranial magnetic stimulation (TMS)‚ a noninvasive technique used to excite or inhibit neurons within the human brain. Prior to testing the participants’ memory abilities‚ each individual’s brain activity was recorded during an magnetic resonance imaging (MRI) scan in order for researchers to precisely target s
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INTRODUCTION If an electric current flows through a conductor in a magnetic field‚ the magnetic field exerts a transverse force on the moving charge carrier which tends to push them to one side of the conductor. A buildup of charge at the sides of the conductors will balance this magnetic influence‚ producing a measurable voltage between the two sides of the conductor. This presence of measurable transverse voltage is the Hall Effect. The Hall effect was discovered in 1879 by Edwin Herbert Hall
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Saturable reactor or magnetic amplifier is a circuit that used to control very large load of AC with very small input DC. The saturable reactor consists of three essential elements : Direct current source‚ magnetic core with windings‚ and alternating current source. How it work? The AC load circuit run on to magnetic core and the DC control circuit is also went on to the same core. Ac current flows through winding and Since this current is alternating‚ the flux set up in the magnetic circuit loop is
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transformer A Transformer based on the Principle of mutual induction according to this principle‚ the amount of magnetic flux linked with a coil changing‚ an e.m.f. is induced in the neighbouring coil‚ that is‚ if a varying current is set-up in a circuit induced e.m.f. is produced in the neighbouring circuit. The varying current in a circuit produce varying magnetic flux which induced e.m.f. in the neighbouring circuit. INTRODUCTION A transformer is an electric device which is used
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induced there are two types of tachogenerators: 1. DC tachogenerator 2. AC tachogenerator PRINCIPLE It operates on the principle of Faraday’s Laws of Electromagnetic induction . It states that whenever there is a relative motion between the magnetic field and a conductor ‚ then the voltage is generated in that conductor. Characteristic requirements of tachogenerator: Accuracy: The input to the tachogenerator is
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1 Electromagnetic Induction: Faraday’s Law OBJECTIVE: To understand how changing magnetic fields can produce electric currents. To examine Lenz’s Law and the derivative form of Faraday’s Law. EQUIPMENT: Circular Coils apparatus‚ PC sound card‚ FFTScope‚ magnet ‚ paper clip‚ cables‚ small (magnetic) compass‚ paper clip‚ multimeter w/long cable INTRODUCTION: Have you ever wondered how a telephone works? You may recall (perhaps in middle school or high school) that sound waves from your voice are converted
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of magnetic material. Pic of ideal transformer The two windings have no conductive connection between them and are kept separate‚ usually by the length of the yoke and also by insulation around the conductive material. In other words they are not linked electrically but they are linked magnetically. On the input side of the transformer (primary winding) a varying electrical current is applied. This varying current produces magnetic flux that flows around the core. This varying magnetic flux
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An electromagnet is a type of magnet in which the magnetic field is produced by 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 like scrap iron. A simple
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