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Physicsissuef
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Hi! I want to know what will happen if I insert current (moving electrons) into Faraday cage, which is ungrounded? Will still there be no electric field, inside the cage?
Can you explain what is happening, please? I sow this quote from wikipedia but can't understand:JayKo said:isn't post #4 already stated clearly, the answer is no current inside ;)
wikipedia said:If a charge is placed inside an ungrounded Faraday cage the internal face of the cage will be charged (in the same manner described for an external charge) to prevent the existence of a field inside the body of the cage. However, this charging of the inner face would re-distribute the charges in the body of the cage. This charges the outer face of the cage with a charge equal in sign and magnitude to the one placed inside the cage. since the internal charge and the inner face cancel each other out, the spread of charges on the outer face is not affected by the position of the internal charge inside the cage. So for all intents and purposes the cage will generate the same electric field it would generate if it was simply charged by the charge placed inside.
Physicsissuef said:Can you explain what is happening, please? I sow this quote from wikipedia but can't understand:
Like this http://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/FaradayscherKaefig.svg/180px-FaradayscherKaefig.svg.png" or?JayKo said:An external static electrical field will cause the electrical charges within the conducting material to redistribute themselves so as to cancel the field's effects in the cage's interior.
Well, if my understanding did not fail me, what quoted from Wiki simply means, Instead of generating the E field outside of the cage, this time round, the E field is generated inside the cage when you put a charge inside the cage.
Physicsissuef said:Like this http://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/FaradayscherKaefig.svg/180px-FaradayscherKaefig.svg.png" or?
How is that possible? The E field is generated outside because of charge inside the cage? Do you have some picture?JayKo said:the E field is generated outside because of charge inside the cage, provided it is not grounded! ;) ;)
hope you can get the picture
Physicsissuef said:How is that possible? The E field is generated outside because of charge inside the cage? Do you have some picture?
The above picture, wasn't correct?JayKo said:if my understand from wiki is correct, let's hear what other might say on this. no picture here unfortunately.
Physicsissuef said:The above picture, wasn't correct?
But man, we are talking about an excess of charges inside the cage. With inserting current, I also insert excess of charges, therefore, there must be somewhere excess of electric field.JayKo said:the above doesn't show any external E field. only when E field is present, the charges will redistribute itself, such that the effect is no E field inside the cage.
you may want to check out some electrostatic concept(induction) and Gaussian law in order to understand how the cage work. gtg.
Physicsissuef said:But man, we are talking about an excess of charges inside the cage. With inserting current, I also insert excess of charges, therefore, there must be somewhere excess of electric field.
JayKo said:you can insert charge, but how you going to insert current flow?
esalihm said:no matter what u do, nothing would happen to you if you are IN THE FARADAY CAGE!
esalihm said:ALL the charge (the electrons) repel each other and try to move as far from each other as they can. They can move up to the sides, corners and outer faces of the cage, until then, they stay there.
that's why no matter what u do, nothing would happen to you if you are IN THE FARADAY CAGE
ok?
Physicsissuef said:Current flow, with lighting.
Physicsissuef said:Hi! I want to know what will happen if I insert current (moving electrons) into Faraday cage, which is ungrounded? Will still there be no electric field, inside the cage?
To the degree that the cage is perfect no.Physicsissuef said:Look at http://www.youtube.com/watch?v=mUWxYesR5Wo" Will the person inside the Faraday cage will die, if he touch it? Will the same happen with lighting strike?
What is perfect cage, can you describe it with few words?NoTime said:To the degree that the cage is perfect no.
Given that it is not possible to construct a perfect cage, then for a direct lightning strike you could die.
A Faraday cage is a conductive enclosure that is designed to block external electric fields. It is named after scientist Michael Faraday, who discovered the concept of electric fields and their effects on conductive materials.
Grounding a Faraday cage helps to dissipate any electric charge that may build up inside the cage. This is important because if the charge is not properly dissipated, it could potentially damage any electronic devices inside the cage.
Inserting current into an ungrounded Faraday cage can significantly reduce its effectiveness. This is because the current will create an internal electric field that can interfere with the cage's ability to block external electric fields.
Conducting experiments inside an ungrounded Faraday cage can be risky as it can lead to the buildup of electric charge, which can damage sensitive equipment or cause electric shocks to the person conducting the experiment. It can also affect the accuracy of the experiment's results.
The effects of inserting current into an ungrounded Faraday cage can be mitigated by properly grounding the cage. This will help to dissipate any electric charge and maintain the cage's ability to block external electric fields. It is also important to follow proper safety protocols and use appropriate equipment when conducting experiments inside a Faraday cage.