Two beads with charges q1 = q2 = +1.37 ?C are on an insulating string that hangs
ID: 2201678 • Letter: T
Question
Two beads with charges q1 = q2 = +1.37 ?C are on an insulating string that hangs straight down from the ceiling as shown in the figure. The lower bead is fixed in place on the end of the string and has a mass m1 = 0.280 kg. The second bead slides without friction on the string. At a distance d = 0.33 m between the centers of the beads, the force of the Earth's gravity on m2 is balanced by the electrostatic force between the two beads. What is the mass, m2, of the second bead? (Hint: You can neglect the gravitational interaction between the two beads.)
Explanation / Answer
q1q2K/r^2=mg m=15.51 gm