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A good atomic dog wouldn't be named Spot, I suppose. The electron is effectively spread out over the whole volume of an atom and isn't concentrated in any one location. Electrons on the atomic scale are more cloudlike than doglike, however. The electrons will strain against the field as far as they can in much the same way that our hypothetical dog will strain against its leash as far as it can. Placing the electrons of an insulator in the presence of an electric field is like placing a tied dog in the presence of a mailman.
CHOFER DE VECTOR 3.5 TONS FREE
An electron in an insulator is like a guard dog tied to a tree - free to move around, but within limits. This is not the same thing as saying they can't move.
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By definition, charges in an insulator are not free to move. Life is much more restrictive for an electron in an insulator. They are free to roam around as much as they want and can run the entire length, width, and depth of the metal on a whim. A conducting electron in a metal is like a racing dog fenced in a pasture. Like charges repel and the electrons run away from each other as fast as they can until they're distributed uniformly throughout one electron for every proton on average in the space surrounding every atom. Release the field and the electrons on the negatively charged side now find themselves too close for comfort. One side of the conductor has become negatively charged and the other positively charged. In no time at all, we'll have an excess electrons on one side and a deficit on the other.
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When a metal is placed in an electric field the free electrons flow against the field until they run out of conducting material. to reduce the possibility of shorting out by sparking (more formally known as dielectric breakdown) during operation at high voltage.to increase the effective capacitance by reducing the electric field strength, which means you get the same charge at a lower voltage and.to keep the conducting plates from coming in contact, allowing for smaller plate separations and therefore higher capacitances.Perhaps the only time the word dielectric is used is in reference to the nonconducting layer of a capacitor.ĭielectrics in capacitors serve three purposes: Pretty much anytime a nonmetallic solid is used in an electrical device it's called an insulator. The glass or ceramic plates used to support power lines and keep them from shorting out to the ground are insulators. The plastic coating on an electrical cord is an insulator. (The greek word for measure is metron - μέτρον.) The material placed across the plates of a capacitor like a little nonconducting bridge is a dielectric. (The greek word for angle is gonia - γωνία.) The measurement across a circle is a diameter. A line across the angles of a rectangle is a diagonal. The greek prefix di or dia means "across". Inserting a layer of nonmetallic solid between the plates of a capacitor increases its capacitance.(The latin word for leader is ductor.) A material that provides safe passage for electric charges is a conductor. (The latin word for road is via.) The person you travel with who leads the way or provides safe passage is a conductor. (The latin word for bread is panis.) To take something with you on the road is to convey it. A person you have bread with is a companion. The latin prefix con or com means "with". In contrast, charges in metallic solids tend to move easily - as if someone or something was leading them. The latin word for island is insula, which is the origin of the word insulator. Since charges tend not to move easily in nonmetallic solids it's possible to have "islands" of charge in glass, ceramics, and plastics.The two words refer to the same class of materials, but are of different origin and are used preferentially in different contexts. Dielectrics are insulators, plain and simple.