If you knew the answer, click the green Know box. Look at the large card and try to recall what is on the other side. Use these flashcards to help memorize information. As more magnetic flux gets forced into the same area, more magnetic domains are available.Ģ5) Transformers are normally operated at the point of saturation. Further increases in flux density are not possibleĢ3) On a graph of a normal magnetization curve, which properties are represented on the two axes.Ģ4) Each normal magnetization curve, or B-H curve, has a knee where increases in the field strength no longer have much effect on the magnetic flux density. organized molecular magnets so that the individual fields add togetherĨ) Permanent magnets might be demagnetized by a sharp blow.ĩ) Permanent magnets might be demagnetized by extreme cold.ġ0) ? is magnetism produced when electricity passes through a conductor.ġ1) The left-hand rule can be used to determine the polarity of a coil.ġ2) ? is the amount of magnetomotive force distributed over the length of a magnet.ġ3) Match the magnetic unit of measure that it is analogous (similar in some respect) to.ġ4) Permeability is a measure of the ability of a material to conduct magnetic flux.ġ5) The reference permeability of pure iron is 6,000 – 8,000 this means it has the ability to conduct magnetic flux better than copper.ġ9) Given the information in the Relative Permeability Chart, ? should be used as a transformer core to get the highest flux density for a given input before saturation occur.Ģ1) Saturation is where a magnetic core has substantially all the magnetic domains aligned with the field and any increases in current no longer result in a stronger electromagnet.Ģ2) When a magnetic circuit reaches a point of saturation, ?. ![]() Transformer Lesson 1 Magnetism and Electromagnetism Questionġ) ? is a force that acts at a distance and is caused by a magnetic field.ģ) A ? can hold its magnetism for a long period of time.Ĥ) All magnets have a north and south pole.Ħ) The force of attraction between two magnets decreases as the distance between the magnets increases.ĭ.
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