CHARGING BY INDUCTION. Learning Goals ■I will be able to show/explain how to temporarily and permanently charge an object by induction.

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Presentation transcript:

CHARGING BY INDUCTION

Learning Goals ■I will be able to show/explain how to temporarily and permanently charge an object by induction.

What is it? ■Charging neutral object by bringing another charged object close to but not touching it.

Consider the following … ■The balloon: –When rubbed on sweater it developed a negative charge. –When brought near wall it pushed negative charges away (induced charge separation) –Balloon stuck because of law of electric charges.

We did this already … ■Ebonite rod and Cheerios lab! –Negatively charged ebonite rod –Neutral Cheerios –Ebonite rod brought close to Cheerios –Neutral Cheerios attracted to Negative Ebonite Rod

Charging Permanently by Induction ■Through induction, we can induce a permanent charge on an object. ■We can either force a positive charge on an object, or a negative one.

Permanently Inducing a Positive Charge Step Description 1 Neutral electroscope. 2 Negative balloon induces charge separation in electroscope. 3 Ground “wire” attached, electrons flow from electroscope into ground. 4 Ground wire is removed 5 Charges spread out evenly, electroscope is positively charged

Permanently Inducing a Negative Charge ■Use the white board to demonstrate this!

Permanently Inducing a Negative Charge Step Description 1 Neutral electroscope. 2 Positive balloon induces charge separation in electroscope. 3 Ground “wire” attached, electrons from ground attracted to positive side of electroscope. 4 Ground wire is removed 5 Charges spread out evenly, electroscope is negatively charged

Learning Goals Revisited ■I will be able to show/explain how to temporarily and permanently charge an object by induction.

Your Turn … ■P.489 #2,3,6