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Electroscopes



                1
Electroscopes


An electroscope is a device that is used to
detect a static charge.
Electroscopes


There are 3 kinds of electroscopes we will see:
1) Pith ball electroscope
2) Metal leaf electroscope
3) Needle electroscope
Pith Ball Electroscope
1) The pith ball electroscope is a ball connected to a
stand using a nonconductive string.
Pith Ball Electroscope


     Nonconductive
         string



         Ball
Pith Ball Electroscope

The ball is able to swing in any and all directions in
response to nearby charges.
Metal Leaf Electroscope
2) A metal leaf electroscope is a vertical conductive
rod with a metal ball on top and 2 thin sheets of
loose metal attached at the bottom.
Metal Leaf Electroscope


        Touch ball

      Conductive bar

       Metal leaves
Metal Leaf Electroscope
If a charge contacts the touch ball then both leaves will
receive this charge and move apart.


                                          +- ---
                                 -+ ---
                             -




        Neutral                            Charged
Metal Leaf Electroscope
Copy this example into your notes.



                                        +- ---
                               -+ ---
                           -




        Neutral                          Charged
Needle Electroscope
3) A needle electroscope has a touch ball attached to a
conductive bar that bends. There is a pivoted free-swinging
needle on either side of (going through) this bar.
Needle Electroscope


      Touch ball


       Needle


    Conductive bar
Needle Electroscope
If a charge contacts the touch ball then the bar and
needle will become the same charge as the rod (by
conduction) and will swivel away.
                                          ---
                                      -+-
                              -- +--




         Neutral                          Charged
Needle Electroscope
Copy this example into your notes.



                                          +- ---
                                 -+ ---
                             -




         Neutral                              Charged

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06 types of electroscopes