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The Magic School Bus is a series of children's books about science, written by Joanna Cole and illustrated by Bruce Degen.Designed for ages 6-9, they feature the antics of Ms. Valerie Felicity Frizzle and her class, who board a sentient anthropomorphic mini school bus which takes them on field trips to impossible locations, including the solar system, clouds, the past, and the human body.
A magnetic gear is composed of magnets of the type permanent, electromagnetic or otherwise magnetically induced fields. It consists of two or more elements that are usually rotating but can be linear or curve linear in nature. The classical gear is defined as a ratio of pole pairs. Where the Pole pairs are magnets N-S and S-N in nature.
With Arnold chewing gum, trying to break the school record for the longest chewing time, he swallows the gum, much to Wanda’s dismay. To Arnold’s surprise, he finally gets his wish by staying at school with their class pet, Liz, while the Friz takes the rest of the class on another weird field trip...without realizing it is his own digestive system.
The rotating magnetic field is the key principle in the operation of induction machines.The induction motor consists of a stator and rotor.In the stator a group of fixed windings are so arranged that a two phase current, for example, produces a magnetic field which rotates at an angular velocity determined by the frequency of the alternating current.
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One A/m equals 10 −3 emu/cm 3. A good permanent magnet can have a magnetization as large as a million amperes per meter. In SI units, the relation B = μ 0 (H + M) holds, where μ 0 is the permeability of space, which equals 4π×10 −7 T•m/A. In CGS, it is written as B = H + 4πM. (The pole approach gives μ 0 H in SI units.
Ferrofluid on glass, with a rare-earth magnet underneath. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements.Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets.
The dimension of magnets varies between different versions, while typically in the range of 1.4 [29]-2 [28] mm square shape with a lower height. The poles of magnets were positioned as a checkerboard array to fit the magnetic field generated by the PCB platform. The robot can be built in different size depending on the size of the array.
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