I know Stephen gray has discovered insulator and conductor. But I want to know that how did he know which one is conductor and which one is insulator ? Please tell me the details how had he done that above thing (that is conductor and insulator)

  • $\begingroup$ Well, one holds static charge readily and one doesn't... $\endgroup$ – Jon Custer May 14 at 17:16
  • $\begingroup$ Wikipedia explains this is very good detail..... $\endgroup$ – KingDuken May 14 at 20:48
  • $\begingroup$ Thanks kingduken but still I couldn't understand how did Stephen gray know which one is insulator $\endgroup$ – user230720 May 15 at 8:21

He inserted cork on both the ends of the glass tube in order to keep dust away and then when he rubbed the glass tube with silk, he found glass tube attracting light objects(same as William Gilbert found in his experiment). But,astonishingly,cork started attracting light object even if it is not rubbed from this he come to know that electricity is not static but it flows then he inserted a stick in the middle of the cork and the same attraction of light objects could be seen in that stick i.e the stick was attracting the light object.Now, he removed stick and inserted one end of the metal wire in the middle of the cork and at the other end of the metal wire, an ivory ball and he found the same attraction by the ivory ball.But now when he inserted thread in place of metal wire ,he found that there was no attraction of light object by the ivory ball. Like this he attached so many materials in between glass tubes cork and ivory ball and those material which where conductors allow ivory ball to attract light object and those where insulator they don't allow ivory ball to attract light object

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    $\begingroup$ Thanks but how the cork here is acting as a conductor? $\endgroup$ – user230720 May 15 at 15:36
  • $\begingroup$ I think cork is also rubbed with glass rod hence it attract light object $\endgroup$ – user230507 May 16 at 5:42
  • $\begingroup$ youtu.be/CXth6EBxBCw in this link you can carefully observe that the glass tube is rubbed so quickly that cork also get little bit rubbed and that part of the cork attracts light object $\endgroup$ – user230507 May 16 at 5:43
  • $\begingroup$ I think like this might have happened with Stephen gray also but he might have thought he didn't rubbed the cork from their he started inserting metal wire which obviously will allow the charge to flow $\endgroup$ – user230507 May 16 at 5:46
  • $\begingroup$ Thanks for clearing my doubt $\endgroup$ – user230720 May 16 at 14:58

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