Which among the following is incorrect as per the law of electrostatics,
a) A plastic rod gets charged when rubbed with woolen cloth
b) An Aluminium rod gets charged when rubbed with sand paper
c) A balloon gets charged when rubbed with a cotton cloth.
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Answer:
b
Explanation:
The best sandpaper for hard metals such as iron or steel is aluminum oxide, while the best sandpaper for softer metals such as aluminum or brass is silicon carbide. Determine the time to change sandpaper by running your fingertip over the section of paper you've been using.
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