Does electro magnetic pulse only effect active circuits?
830503
I assume you're thinking of the kind of EMP that would result if an atomic bomb were detonated overhead, or if some sort of electromagnetic weapon were used in warfare.  The answer is that such an EMP will destroy electronic devices, whether they are operating or not.  The magnetic pulse induces a voltage in the conductors of the circuitry, which causes high currents to destroy semiconductor devices.
1135256
Conduction?  I'm not aware of magnets having such a property.
312735
Try a damping circuit.
1023798
I heard a myth that if you keep pressing 0 over and over, it will come close to blowing their circuits, and someone will pick up.  I've never tried it, but I've always wanted to, just to see if it's true.  :)
140958
To answer your question first: Yes, it will generate a back EMF in the circuit each time the power to the electromagnet is turned off, but this energy is never equal to the energy which was originally applied when you turned the switch on.  Nothing in life is free :)  \n\nWhat you're describing is actually called a transformer. A transformer works by applying an alternating current (equivalent to turning your hypothetical switch on and off very quickly, many times per second) to one coil, which induces current in another coil (or several, depending on the design).  \n\nWhile a transformer can be relatively efficient, it can never be 100%, and certainly not MORE than 100%, as you describe.
743760
1.a) receives the alternating current. \n b) the magnetic properties are altered by the electromagnetic field. . \nc) by the alterations in the core induces other alternating current in this coil. \n2.a) because the alternating current induces the varying magnetic field.\nb) that magnetic flux is passed by the core to the secondary coil.\nc) yes an alternating one. \n\nBecause radioactivity destroy organic tissues.
1184980
Differential equations is very useful to electronics inductries. This is commonly used in designing electrical circuit and their responses to the signals. Input current response, voltage responses and even time decay is critical to the computation of integrated circuit responses. Without is certain electrical functions such as response time, triggering mode, active and inactive function regions will not be possible.
1023911
Electromagneticradiation
1122187
An inverter by itself can only take one logic state and invert it to another.   For example, a logic 1 on the input would be inverted to a logic 0 and vice-versa.  This logic state will be held until the input's logic state changes.\n\nTo get a pulse, you need the logic state to invert only temporarly before returning to its original state. \n\nTherefore, an inverter by itself cannot be used to generate a pulse.  You could use a simple RC (resistor-capacitor) network on the input of an inverter to generate a pulse though, but it would not be repetitive.
1026855
I agree with the others, you questions is unclear.\n\nThe only thing I can say (wild guess) is that there are some telemetry circuits that use a slight current as a zero point.  If the current actually goes to zero, they know there is a problem with the circuit.  Otherwise, they might not know until a lot of damage has been done, depending on what is being monitored.
56370
they cause electromagnetic stroms
1076485
i dont know much about physics but i did a search and this is what i got hope it has what you're looking for:\n\nhttp://science.electronicsinfoline.com/Physics/Electricity_and_Magnetism/
653342
applied electronics & instrumentation
206602
In D.C circuits current flow is  always  in one direciton.\nIn A.C circuits current is fluctuating that is changing its direction periodically, say 50 times per second or 60 times per second. But in A.C when the current is switched off suddenly in some circuits having coils and condensers there will be back emf and sparks will be prduced in the switching system. Normally the device is manufactured taking this into account.
448481
The concept is to build an electromagnet that cuts the circuit when energised. This produce a buzzing effect
1085489
Metal objects such as the spoon & the pointed ends of the fork act to concentrate the electric field formed at the tips. This has the effect of exceeding the dielectric breakdown gradient of air, about 3 megavolts per meter (3×106V/m), causing sparks to form. This effect is somewhat analogous to the effect of St. Elmo's fire.\nMetal or conductive object placed into the microwave will act as an antenna, and its electrons will thus be thrashed back and forth through the object (a high frequency alternating current) causing some ohmic heating to occur\n\n- no damage to magnetron, but !
919244
If you are using the hall effect switch itself to change the magnetic field, I guess we would need to know what the amperage requirement of the electromagnet is to spec out the part.  \n\nThis answer is also difficult because we don't know the strength of the magnetic field used to trip the switch nor the time which the magnet would be in the switch range nor the distance from the magnet to the switch.\n\nIf you have access to a bunch of reed or hall effect switches, I would suggest trying several to see which one works?\n\nAlso -- a suggestion -- i would use the hall effect switch as a sensor switch only and not try to run it as a direct switch connected to an electromagnet.  Use it to trip a transistor or FET that will, in turn, drive the electromagnet.  \n\nDoes this help?