why lines of forces of electric field can pass through insulators but not conductors?
817691
Becuase of Gauss's Law. Electric field lines end or are deflectecd where there is a charge, and the charge in a conductor can only exist in the conductor's surface as a result of Gauss's Law.
183140
Things are only affected if they are charge particles in electric fields. I don't think there are any charge particles in plants significant enough for an electric field to cause a change in it.
307942
hey its very simple. when we take a conductor in temperature equal to or less than to is critical temperature then it becomes super conductor. that means it have very resistance and current can flow easily.Now when this conductor is put in a magnetic field the filed lines in the conductor moves towards outward region.that means there is no field lines present inside a conductor under this situation.this effect is called messiners effect.
268827
That's the definition of equipotential lines, basically.\n\nIf you move perpendicular to the electric field, you do no work (so potential doesn't change).
927615
Actually paper does interact with magnetic fields.  It "hinders" the magnetic field.  I am referring to the ease with which the magnetic flux can pass through a substance.  Everything has a such a value.  It is comparable to the dielectric constant in capacitors.  Metals pass magnetic fields fairly readily though there is some difference even between the metals.
197303
Transmission of electricity can be likened to "transmission" of water where voltage is equivalent to water pressure and electric current is equivalent to water flow.  For a hydraulic car lift you can get the same power (lifting force) using low pressure (voltage) with a large cylinder (line) or high pressure with a smaller cylinder.  For that reason a high voltage transmission line needs to carry less current for a given power than a lower voltage line.  It is the current and not the voltage that heats a wire and the transmission lines must be sized to pass needed current without too much heating.  I believe that power companies can reduce voltage and increase current to slightly heat the transmission lines to avoid icing (and weight) during winter storms.\n\nYou can safely grasp a 110 Volt insulated electric cord, but ordinary insulation would not prevent high voltage from arcing through the insulation (it would break down a path) and electrocute you.  Therefore High Voltage lines are not insulated but are instead supported by large non-conducting ceramic insulators to hold the conductors far enough from the towers to prevent arcing.  There may be a separate wire above the high voltage transmission lines to arrest lightning strikes.
165187
Glass, teflon, bakelite and ceramics are among the best insulators.\n\nSilver is the best conductor of electricity, followed by copper.  Note that gold is often used for electrical contacts  NOT because it is the best electrical conductor, but because it is perhaps the least chemically reactive of metals.\n\nSeveral corrections to an answer below:\n\n1. Gold is a better conductor than aluminum. \n2. Air and vacuum are relatively poor electrical insulators, not even close to being the best. \n3. A glass insulator is 100 times better than either air or vacuum, and 1.3 to 2 times better than teflon. \n4. Mica is an even better insulator: 250 times better than air, and 2.6 times better than teflon.
1088099
insulators ; conduction
456231
Because they are not grounded (i.e. they are making contact with nothing but the line) the electicity doesn't flow through their bodies. \nI lived on a farm as a kid and when we were wearing rubber boots we could touch the electric fence without getting zapped for the same reason: the rubbed didn't conduct so we weren't grounded.
749223
The flow of current is caused by an electric field being applied to a material if there are electrons which are not tightly bound to the atoms in the material. \n\nIn a metal, an electric field will apply enough force to the electrons to allow them to move from one atom to the next, as long as there is a free electron to replace it. The free electrons may come from a battery, or a loop of metal wire spinning in a magnetic field, for example. The bond of the electrons in the outer atomic shells to the nucleus is not so strong.\n\nOn the other hand, for an insulator, even very high electric fields will not encourage the electrons in the outer shells of the atoms to leave the atom. They are tightly bound to the nucleus.
763497
There is not one speed to electricity, there are two.\n\nThe electron drift rate, determined by the number of conductors, the applied, field, and the mean free path, and the field transfer rate aka the speed of light in the material.\n\nAll conductors have resistance - its like friction for electricity.  Even "superconductors" have it, thought its a lot less than in other conductors.  Just like a ball you roll eventually stops, so will electron motion.\n\nIf you had a superconducting power strip, and a very fast plugger, you could make it plug into itself and it would glow for a long time.  The light would make it glow for a lot less long of a time.  Thats all about initial current voltage, and internal resistance.
975863
Connection? or disconnection...\n\nSemiconductors are not metals - nor do they intend to be.
692204
Just a minor nitpick on what others have said.  Electricity can also be the motion of holes, which can be thought of as the absense of an electron.  But generally it is the motion of electrons.
942587
poorcocoboiboi is correct, however the electric field is still there even after the charge is moving. In fact it is the moving electric field that produces the magnetic field.
26238
buildings do not reach into ionosphere. Surface of eath has zero charge (hence grounding). Lightning goes  from a cloud to the ground, or into another cloud. \n\nAll tall buildings have lighning protection, i.e. a thick metal wire going from top-most point and into the ground.
934554
The passage of electric Voltage is the movement of electrons through a substance. This is down to two main factors.  \n1 The type of bonding.  In metals which tend to be the most conductive the bonding is called a metallic bond.  In this type of bonding the electrons are free to move throughout the whole substance think of it as protons floating in a sea of electrons.  With ceramics for instance the predominate type of bonding is covalent where the electrons are shared between different atoms in the ceramic matrix.  This restricts the ability of the electrons to move and as a result Ceramics tend to be insulators.\n\n2 Atomic Structure.  This can effect the conductivity and many other properties.  Depending on how the atoms are spatially alligned, electron movement can be hampered of assisted.
248482
Ohm's Law is always obeyed.\nIf a conductor is non-linear it has a coefficient of resistance - thermal, pressure, tensile, even voltage-dependent.\nMeasure the current thru it and the voltage across it and you have the instantaneous resistance at the time of measurement.\nThe law stands, but the result may not be static.