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One way of painting complex-shaped objects involves using a method in which paint is sprayed from a nozzle which is positively charged. The article...

One way of painting complex-shaped objects involves using a method in which paint is sprayed from a nozzle which is positively charged. The article to be painted is negatively charged.
From your understanding of charge as explained in S104 Book 3 explain how the process works and hence why this is a very efficient way of spraying compared with normal spray painting (with no charge). Include in your answer explanations as to:
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why a voltage difference must be applied to the system of the nozzle and the article during the painting process
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the electrical property that the surface of the article to be painted must have.
We expect you will be able to answer all of part (a) in about 160 words.

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