Electricity by liaoqinmei

VIEWS: 8 PAGES: 12

									Electricity: Charging
by Induction
SNC1D0
Static Electricity
                        Static electricity can
                         be generated
                         through:

                          Friction


                          Conduction


                          Induction
Induction
 INDUCTION involves the movement of
  electrons in a neutral object when a
  charged object is brought close to the
  neutral object.
 The movement occurs WITHOUT DIRECT
  CONTACT between objects.            Note: Electrons
                       Negatively
                                                moved to one
                      Charged Rod
                                               side WITHIN the
                                                    sphere


    Neutral Sphere
                                    Charged Sphere
Charging by Induction




 1. Charging      2. Charging
    Temporarily      Permanently
Induction
   There are two forms of induction:
1. Induced Charge Separation/ Temporary Charging

   When a negatively charged rod is brought close to a
    neutral metal rod, the electrons in the neutral rod
    move to one side of the object.
   The electrons move back when the charged object is
    removed.
   THIS IS A TEMPORARY CHARGE.
   There is no change in the number of electrons on the
    object, so overall THE OBJECT REMAINS NEUTRAL.
1. Induced Charge Separation/ Temporary Charging
Practice: Charging by Induction
 Go through temporary and permanent induction
 to describe what happens when a positive rod
 approaches the electroscope
Induction
   There are two forms of induction:
2. Permanent Charging

   When you take a temporarily charged object and
    ground it, the charged object retains its charge.

   This is called permanent charging by induction.
Induction
     There are two forms of induction:
  2. Permanent Charging by Separation




a. Neutral Sphere       b. Negatively charged      c. Electrons leave the
                        rod, charged the sphere    sphere through the
                                                   conducting wire




            d. Negatively charged     e. Sphere becomes &
            rod is removed            remains positively charged
Induction
   Charging by induction always results in
    two objects with different charges.

   The object that induces the charge keeps
    its original charge, while the object whose
    charge was induced receives the opposite
    charge.
Summary: Transferring Electric
Charge
There are three ways objects become
  electrically charged
 Friction eg: static on clothes from dryer;
  tumbling creates friction
 Contact eg: touch uncharged doorknob
  after becoming negatively charged from
  carpet
 Induction eg: lint sticking to clothes (no
  direct contact)
Assignment
 TB: Read Pg. 285 – 287
 TB: Pg. 287 # 1 – 6

								
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