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Dx

I have some missed test questions that I still don't understand. Can anyone please explain these.

1)

Two chrged objects atrract each other with a force F. What happens to the F between them if one is doubled, the other is tripled and the separation distance between their centers is reduced to 1/4 its original value? the force is now equal to

16F

3/8F

96F

2)What is the charge on 1kg of protons?

1C

9.6 x 10^7 C

6x10^26C

3)A copper penny has mass 3g. A total of 4x10^12 electrons are transfored from one nuetral penny to another. if the electrostatic force of attraction between the pennies is equal to the weight of a penny, what is the separation between them?

31cm

35cm

37cm

4) How can a negatively charged rod charge an electroscope negatively? Is it by conduction because its not induction.

can anyone gimme their answer and how they derived it since I missed it I provided the remaining test answers to help you choose from. Please any help is appreciated as always.

Thanks!

Dx