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Unit Plan
Unit Plan

... Students will investigate the role of magnets in our history and society. For example, magnets are used in compasses, without which early seafarers wouldn’t have know which direction they were moving when they couldn’t see the sun. Magnets are found all around us in generators, electric motors and s ...
Magnets
Magnets

... 2 Steel is an example of a ferromagnetic material. -------3 Every magnet has ___ where the attraction is strongest. 4 The rule for magnetic poles is : “ like poles ___; opposite poles ___.” 5 Earth has two magnetic poles. 6 Earth’s geographic north pole is _____. 7 Electrons are tiny _______. 8 In t ...
MAGNETISM MAGNETISM
MAGNETISM MAGNETISM

Magnetic Fields
Magnetic Fields

... Wire A carries 2.0 A. Wire B’s current is 4.0 A in the same direction. a) Determine the magnetic field magnitude due to wire A at the position of wire B. b) Determine the magnetic field magnitude due to wire B at the position of wire A. c) Are these two magnetic fields equal and opposite? d) Determi ...
Chapter 8 Test Review – Electricity and Magnetism
Chapter 8 Test Review – Electricity and Magnetism

lecture17
lecture17

Inv 16
Inv 16

Magnetism - Physics: 1(AE) 2(B,D)
Magnetism - Physics: 1(AE) 2(B,D)

Inv 14
Inv 14

... the earth when the magnet is free to rotate and is not interacting with other nearby objects. On the basis of this definition and assuming that the earth is a magnet, is the geographic north pole of the earth the north-seeking pole or the south-seeking pole of a magnet? Explain. THE GEOGRAPHIC NORTH ...
Can the amount of current change?
Can the amount of current change?

Magnetic Levitation
Magnetic Levitation

... But, if I flip one of the magnets over and I try and push the two south poles together, they resist and push apart. They never connect to each other, no matter how hard I push. Take a look at the levitating pencil again. I lined up all the south poles so they would repel each other, which makes the ...
Magnetic Art
Magnetic Art

Study_Guide_for_Unit_Magnetism
Study_Guide_for_Unit_Magnetism

... 9. What are three examples of electromagnets used in transportation, communication, and everyday devices? ...
Magnetism - Cloudfront.net
Magnetism - Cloudfront.net

Electricity (1)
Electricity (1)

... atoms…they can be moved.  A concentration of electrons in an atom creates a net negative charge.  If electrons are stripped away, the atom becomes positively charged. ...
Lecture 18 - UConn Physics
Lecture 18 - UConn Physics

... • Suppose we pull with velocity v a coil of resistance R through a region of constant magnetic field B. – What will be the induced current? » What direction? • Lenz’ Law  clockwise!! ...
Electricity - WordPress.com
Electricity - WordPress.com

... Electricity is the set of physical phenomena associated with the presence and flow of electric charge. Electricity gives a wide variety of well-known effects, such as lightning, static electricity, electromagnetic induction and the flow of electrical current. In addition, electricity permits the cre ...
Word
Word

... 18) When a bar magnet is pushed N pole first into a solenoid, the needle of a galvanometer connected to the solenoid moves to the right. The needle will move to the left when the magnet is then a) pulled out the bottom b) pulled back out the top c) held stationary d) both answers a) and b) 19) A mag ...
How could a Rotating Body such as the Sun become a Magnet?
How could a Rotating Body such as the Sun become a Magnet?

... path around the solar axis happens to be open, an electric current will flow round it, which may in turn increase the inducing magnetic field. In this way it is possible for the internal cyclic motion to act after the manner of the cycle of a self -exciting dynamo, and maintain a permanent magnetic ...
On a New Action of the Magnet on Electric Currents
On a New Action of the Magnet on Electric Currents

... Some of the series seemed to show a sligoht increase of resistance due to the action of the inagnet, some a slight decrease, the greatest chang,e indicated by any complete series being a decrease of about one part in a hundred and fifty thousand. Nearly all the other series indicated a very much sma ...
Electricity and Magnetism
Electricity and Magnetism

... electricity and current electricity? Static electricity is stationary or collects on the surface of an object, whereas current electricity is flowing very rapidly through a conductor. The flow of electricity in current electricity has electrical pressure or voltage. Electric charges flow from an are ...
Magnetic properties of superconductors
Magnetic properties of superconductors

... Non-superconducting magnetized bodies also have surface currents ...
Average 78.3% (`16) 81.6% (`15) 77.5% (`14) 84.5%(`13) 81.6%(`12
Average 78.3% (`16) 81.6% (`15) 77.5% (`14) 84.5%(`13) 81.6%(`12

ppt
ppt

... Electric field lines originate on positive charges and terminate on negative charges Magnetic field lines always form closed loops – they do not begin or end anywhere A varying magnetic field induces an emf and hence an electric field (Faraday’s Law) Magnetic fields are generated by moving charges o ...
PHYSICAL SCIENCE
PHYSICAL SCIENCE

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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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