Charging without contact Induction Charging without contact

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

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)

Inducing a permanent charge

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

Positively charged strip Induction electrons

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

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

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.

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

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