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Homework Statement
Describe how a metal sphere on an insulating stand is charged if a positively-charged rod were to touch the sphere. (This is a 5 mark problem, so at least 5 major points should be included in the answer. I am not sure whether I have fully answered the problem.)
Homework Equations
Not applicable, of course.
The Attempt at a Solution
The electric charge is created by conduction (charging by contact). When the positively-charged rod touches the sphere, some of the positive charge from the rod spreads onto the metal sphere because like charges repel one another. When the rod is removed, the positive charge spreads evenly over the metal sphere and remains there since the insulating stand prevents the flow of the charge to the ground. The positively-charged rod has given the sphere a positive charge.
I have another problem which I have no idea as to how to solve it:
Homework Statement
A positively-charged balloon will stick to a wooden wall by polarizing molecules in the wooden wall to create an oppositely-charged surface. Describe how the charges are aligned on both the balloon and the wall. (This is a three-mark problem.)
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