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why do they say that the conducting region of the drum will have a negative charge? As I thought that only enough electrons from the Earth would flow in to neutralise the positively charged surface until it is uncharged and neutral.

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Can electrons move between insulators when touched? Or does it need to be rubbed?

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Is it that insulators cannot conduct electricity AT ALL or can a little but need to be at super high potential?

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May I ask if electrostatic force, electric force and electrical force refer to the same thing?

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for electrostatics is it okay to say induce negative charges?

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http://phet.colorado.edu/sims/html/john-travoltage/latest/john-travoltage_en.html
You may add relevant images to support your answers.

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Q1 What happens when he walks on the carpet?

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Q1 What happens when he walks on the carpet?

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Q2 What is this method of charging called? 

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Q2 What is this method of charging called? 

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Q3 What do the blue particles represent?

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Q3 What do the blue particles represent?

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Q4 What happens when his finger touches the door knob? 

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Q4 What happens when his finger touches the door knob? 

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Mr Ang, the notes say that the definition is the region which an electric charge experiences an electric force but the answers to the exercise say that it’s actually a charged particle experiencing an electric force. May I know which one is correct?

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1) what is the difference between the tendency to gain and lose electrons (tribo series) and whether the object is an insulator/conductor?

2) If I have two same sized objects of equal positive charges, will there still be a movement of electrons between the two mediums? Will the person touching one of the mediums feel a zap?
3) If I have two same sized objects of equal positive charges but of different materialtouch each other, what will happen?

4) what determines when the flow of electrons will stop? Is it the number of positive charges, the size of the medium or the potential difference?

5) is it alright if you could explain the meaning of the definition of field line? (= the path in which a light positive charge would move if free to move)

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May I know why is the type of field for part a radial?

Thank you!

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When you bring a positive rod near the right side of the sphere, electrons are attracted to the left, allowing the sphere to gain a net negative charge on the left and a net positive charge on the right. When you earth it, electrons flow from the ground to the sphere. Given that the point at which you earth the sphere (e.g. at the top of the sphere, the left/right of the sphere) doesn’t matter, why do electrons flow to the sphere instead of away? For example, if the earth had been placed at the left hand side of the sphere (net negative charge), do electrons flow to the sphere because they are also attracted to the positive rod? Thank you very much, Mr Ang!

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is it right to say that something is negatively induced?