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Electricity and Magnetism Study Guide - Mr. L`s Room
Electricity and Magnetism Study Guide - Mr. L`s Room

... magnet will always point north when allowed to swing freely such as in a compass. Magnets always have 2 poles. Magnetic effect is always strongest at the poles—North and South, Like poles repel. Opposite poles attract. This interaction is called magnetic force. ...
HW8: Ch. 27 P 22, 23, 29, 39 Ch.28 Q 1, 3, 6,10 P
HW8: Ch. 27 P 22, 23, 29, 39 Ch.28 Q 1, 3, 6,10 P

knowledge quiz - Discovery Education
knowledge quiz - Discovery Education

Permanent magnets are just collections of little current loops
Permanent magnets are just collections of little current loops

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Magnetic field

... cobalt, or nickel can be made into permanent magnets by placing them in a strong magnetic field. ► This creates a magnetic field inside the material ► It can retain magnetic properties for a long time. ► Permanent magnets can lose their magnetism if heated or dropped. ► When a magnet is broken, each ...
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Experiment 3.3 Thomson Experiment Aim To use a computer

electrom - studylib.net
electrom - studylib.net

... produced by such an electromagnet depends on the number of coils of wire, the magnitude of the current, and the magnetic permeability of the core material; a strong field can be produced from a small current if a large number of turns of wire are used. Unlike the materials from which permanent magne ...
Producing Electric Current
Producing Electric Current

...  When the coil is fixed and the magnet rotates, the current is the same as if the coil rotates and the magnet is fixed.  Construction of a generator in a power plant  Electromagnets contain coils of wire wrapped around ...
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Learning Objectives

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Module II – Discovering Electrical Phenomena

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Waves & Oscillations Physics 42200 Spring 2015 Semester
Waves & Oscillations Physics 42200 Spring 2015 Semester

... • An electric charge changes the properties of the space around it. – It is the source of an “electric field”. – It could be defined as the “force per unit charge”: ...
Producing Electric Current
Producing Electric Current

...  When the coil is fixed and the magnet rotates, the current is the same as if the coil rotates and the magnet is fixed.  Construction of a generator in a power plant  Electromagnets contain coils of wire wrapped around ...
III. Producing Electric Current
III. Producing Electric Current

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Magnetism Section 1 Magnetism A. —the properties and interactions

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III. Producing Electric Current

... A. Electromagnetic Induction  Electromagnetic Induction  producing a current by moving a wire through a ...
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Physics 122 – Class #28 (4/28/15) – Announcements Torque on an

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Maxwell`s Equations 1.The concept of displacement current was a

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Electricity

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A fast, high-tech, low cost electric motor construction

... coiled wire and magnets. Since one expects something complex from something complicated, one is not more surprised by the possibility to make something moving from an inanimate object. One sees surprise and fascination, not only amongst experts when, before one's eyes, a motor is assembled in a few ...
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Impulse Magnetizer X-Series

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fourth nine weeks

... mirrors, prisms, tuning forks, optical illusions, lights, color, musical instruments, common household items to demonstrate sound and light qualities. Post assessment – quiz ...
< 1 ... 89 90 91 92 93 94 95 96 97 ... 118 >

Eddy current

Eddy currents (also called Foucault currents) are circular electric currents induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor. The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.By Lenz's law, an eddy current creates a magnetic field that opposes the magnetic field that created it, and thus eddy currents react back on the source of the magnetic field. For example, a nearby conductive surface will exert a drag force on a moving magnet that opposes its motion, due to eddy currents induced in the surface by the moving magnetic field. This effect is employed in eddy current brakes which are used to stop rotating power tools quickly when they are turned off. The current flowing through the resistance of the conductor also dissipates energy as heat in the material. Thus eddy currents are a source of energy loss in alternating current (AC) inductors, transformers, electric motors and generators, and other AC machinery, requiring special construction such as laminated magnetic cores to minimize them. Eddy currents are also used to heat objects in induction heating furnaces and equipment, and to detect cracks and flaws in metal parts using eddy-current testing instruments.
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