Suppose you touched a pith ball suspended from an insulating string to a charged

Question

Suppose you touched a pith ball suspended from an insulating string to a charged Teflon rod. You then made a second pith ball touch the first one with no other objects near by. You then put the top of the strings next to each other as shown at right. The two pith balls would be separated by 2 cm. The mass of each pith ball is 0.1 g and the length of each of the string is 20 cm. (ignore the mass of the strings)

a) What is the magnitude is the electrostatic force on one of the pith balls? You can assume that angle with vertical is small so that sin .

F = ___________N (For this problem I dont understand how to set it up because I do not think that I know the q value so I cannot see how to do the calculation)

b) Assuming the two balls are point charges at the end of the strings calculate the magnitude of the charge on one of the balls.
Q= ______________ C

Explanation / Answer

q=2Lsin (mg/k)tan after putting in values and solving for q, use coulomb's law where both q's have equal value to find the electrostatic force

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