1. Charging without contact
Induction
Charging without contact

2. What is Induction? A process of transferring charge without contact.
A redistribution of electrical charge in an object, caused by the influence of nearby charges.
Change in polarity
negative neutral overall v

3. Induced Charge Separation: Temporary Charging by Induction
The shift of electrons within an object near a charge.
The overall charge of the object remains neutral , but the shift causes either side to have charged characteristics.
Insulator (dust cloud)

4. Inducing a permanent charge

5. 2-4 1 5 Negative Applied = Positive Charge Neutral object
Negative charge applied
Electrons are repelled by the negative charge
Ground wire attached and grouped electrons leave
Overall charge left is positive
2-4 1 5
electrons

6. Positively charged strip Induction
electrons

7. When charged object taken away…
Charge and conducting wire removed v
Negative

8. OVERALL>>> Charging without touching
Induction can be permanent or temporary
Induction results in two object with opposite charges

9. Car Painting
Tiny paint particles from the spray gun are charged as they pass an electrode attached to the gun. The object that is to be painted is given a charge opposite to the charge of the paint. Paint that would normally miss the object are pulled toward it. Ensures an even coating.

10. Dust Control Air cleaners in homes and hospitals
Dirty air is sprayed with positively charged ions. Positive ions attracted through induction.
Air is then forced between negatively charged plates.
Positive dust sticks to the negative plates

11. Electroscope
An electroscope is an early scientific instrument that is used to detect the presence and magnitude of electric charge on a body. It was the first electrical measuring instrument.
A charged object is then brought close to the instrument's top terminal. This causes a redistribution of the charges inside the electroscope's metal rod,
top terminal gains a net charge opposite to the rod
Gold leaves gain a charge of the same polarity as the rod.
Since both leaves have the same charge, they repel each other and spread apart.
If grounded, the opposite charge (from charging object) is given to the electroscope