Understanding Charge in Physics: Solving a Problem with Plastic Wrap

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SUMMARY

The discussion centers on the electrostatic interaction between a positively charged piece of plastic wrap, with a charge of +3 x 10^-7 C, and a negatively charged roll of plastic wrap. It is established that the roll must possess an equal and opposite charge of -3 x 10^-7 C to create the observed attraction. This phenomenon is explained by Coulomb's Law, which governs the behavior of charged objects. Understanding these principles is essential for solving similar physics problems involving electrostatics.

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indieindie85
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Hi, sorry if this is in the wrong forum.

I have a physics problem I do not understand:

Jim is removing a piece of plastic wrap from a large roll. However, he is finding that this is difficult because the piece of plastic wrap keeps trying to stick to the roll. If the charge on the piece of plastic wrap is +3*10^-7 C, what is the charge on the roll of plastic wrap? How do you know this?

I know the plastic wrap roll is negative charge, and that's about it.

Help!
 
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