# Electricity by liaoqinmei

VIEWS: 8 PAGES: 12

• pg 1
```									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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