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)

The goal is to determine the magnitude of the charge on each ball. We will accomplish this by first determining the electric force that each ball exerts on the other.
http://www.webassign.net/userimages/Two_balls.png?db=v4net&id=97946

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? ? ?.

Felectric = N

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 =

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Suppose you performed the experiment again (expt. 2). The angle between the strings in experiment 2 is twice that in experiment 1.

What is the ratio of the electrostatic force on the left ball in experiment 2 (F2) to the electrostatic force on the left ball in experiment 1 (F1)? (You can still assume that sin?2 ? ?2)


F2/F1 =


What is the ratio of the charge on the left ball in the experiment 2 to the charge on the left ball in experiment 1?


Q2/Q1 =

Explanation / Answer

here

elecctric force = horigental force component on the ball

kq2 /r2=mg( bcose is small)

                            here =l/r

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