The Method

Sample Responses
Let's say you are holding two tennis balls (one in each hand) and let's say these balls each have a charge Q. Estimate the maximum value of Q so that the balls do not repel each other so hard that you can't hold on to them.
1. I think that the hardest part of this problem is to assume how much force can i hold. I assumed that it is about 150N. Now the distance between two hands is approximatelly 1.5 m So using F=(k|q1||q2|)/r^2 we can find |q1||q2|=3.75*10^(-8) Since q1=q2 q=sqrt(3.75*10^(-8)=1.9*10^(-4)C.

2. The maximum value of Q would be very small a rough estimate might be around zero like 10^-12 C. Again the number would have to be very small.

3. If it were as great a one C then it would be pretty hefty. Thus it would have to be a fraction of a Coulomb but larger than a micro Columb. Just a guestimation of course.

4.The answer to this question depends on how strong or weak the person in question is and how far the t-balls are placed apart. Since I personally don't know how many newtons of force I am able to exert, I'm just going to assume that I can hold on to a force of, say 10 newtons, and the balls are 2 meters apart. Then, Q would equals 3.33e-4 coulomb.