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A Magna Doodle drawing board. Magna Doodle is a magnetic drawing toy, consisting of a drawing board, a magnetic stylus, and a few magnet shapes.Invented in 1974 by Pilot Corporation, [1] over forty million units have been sold to date worldwide, under several brands, product names and variations, including Tyco and Mattel/Fisher Price.
Magnetism is the class of physical attributes that occur through a magnetic field, which allows objects to attract or repel each other.Because both electric currents and magnetic moments of elementary particles give rise to a magnetic field, magnetism is one of two aspects of electromagnetism.
Most solid materials are non-magnetic, that is, they do not display a magnetic structure. Due to the Pauli exclusion principle, each state is occupied by electrons of opposing spins, so that the charge density is compensated everywhere and the spin degree of freedom is trivial.
This page lists examples of magnetic induction B in teslas and gauss produced by various sources, grouped by orders of magnitude.. The magnetic flux density does not measure how strong a magnetic field is, but only how strong the magnetic flux is in a given point or at a given distance (usually right above the magnet's surface).
Download as PDF; Printable version; ... [4] They are the only magnets that have useful magnetism even when heated red-hot. [5] ... R1-0-4 10 19 13 3 - 1.7 13.5 7500 ...
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JumpStart Adventures 4th Grade: Haunted Island is a personal computer game in Knowledge Adventure's JumpStart series of educational software intended to teach a fourth grade curriculum. The game was released on December 2, 1996. In November 1997 and in August 1998, revised versions of the game were published.
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