Induction and Grounding

Induction
with Grounding

"Which image correctly shows the electron distribution of a negative balloon touching a neutral wall?" June 1996

Try this at home!

Charged comb attracting a coke can

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YouTube Channel

School blocks YouTube?
Use the file below.

PepsiComb.wmv

Grounded, neutral objects
gain or lose electrons by induction.

Case III - Negative rod/neutral object

[ Flash ]

Electrons are repelled down into the ground. Object becomes positive

Case IV - Positive rod / neutral object

[ Flash ]

Neutral object becomes negative as electrons are drawn up from the ground

Case V – Induction w/ grounded electroscope

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Where_did_the_charge_go

1. A negative rod is brought near,
top touched, finger removed, rod removed.

2. A negative rod is brought near,
top touched, rod removed, finger removed.

Electroscope grounded

When Ground Removed,
Electroscope Maintains Charge 

Electroscope Charge?

Positive

Electrons left Electroscope

What would the charge on the the electroscope be if a positive rod were used?

Negative