1. Sorry I can\'t attach a picture, but I will describe it.There is a picture of

Question

1. Sorry I can't attach a picture, but I will describe it.There is a picture of a student holding balloons on strings withshoulders spread wide, (one balloon on each end). The question iswhat occurs as the student brings the balloons closer to each otherwithout allowing them to touch?
a) The magnitude of electrostatic force decreases and they attractb) the magnitude of electrostatic force decreases and they repel c)The magnitude of electrostatic force increase and they attract d)The magnitude of electrostatic force increase, and they repel
(I picked b, but I really am confused on this problem. Pleaseexplain how to do step by step (concept-wise). Thanks
2. If a small sphere possesses an excess of 5 electrons, the chargeon the sphere is?
a) -3.2 x 10^-20 b) -8.0 x 10^-19 3) -8.0 x 10^19 4) -3.2 x10^20

Again I really have no clue, as to how I use the info given tosolve this problem. Please explain step by step. (Like how does 5electrons part help in solving?)

Explanation / Answer

When answering these, I am assuming that the balloons areneutral meaning they have the same amount of positive and negativecharges since you did not specify that they are positively ornegatively charged. F = kq1q2/r2 As you decrease distance, the force will increase so you canimmediately eliminate a and b. Now, assuming that the balloonis an insulator, the charges will be able to move just a little bitso that they will attract one another. For the second one, if you have 5 excess electrons, you needto multiply the five by charge of an electron (-1.6 *10-19C) 5 * -1.6 * 10-19C = -8 * 10-19 Hope that helps Hope that helps

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