Based on this information: Trial Number Pith ball mass Wand charge # Charge on e
ID: 1407833 • Letter: B
Question
Based on this information:
Trial Number
Pith ball mass
Wand charge #
Charge on each ball
Separation distance between the center of the pith balls
Length of the string from the center of ball to the hanging point
deflection angle of the pith balls
#1
0.050g
120
6.168 · 109C
4.0 cm
39.0 cm
6.0
#2
0.050g
100
4.692 · 109C”
7.0 cm
39.0 cm
5.0
#3
0.050g
80.0
3.357·109C
5.5 cm
39.0 cm
5.0
. How many electrons reside on each pith ball?
2. What is the charge on each pithballs in Coulombs? Is it the same as the values given by the info box?
3. What is the electrostatic attraction between the two pith balls?
Trial Number
Pith ball mass
Wand charge #
Charge on each ball
Separation distance between the center of the pith balls
Length of the string from the center of ball to the hanging point
deflection angle of the pith balls
#1
0.050g
120
6.168 · 109C
4.0 cm
39.0 cm
6.0
#2
0.050g
100
4.692 · 109C”
7.0 cm
39.0 cm
5.0
#3
0.050g
80.0
3.357·109C
5.5 cm
39.0 cm
5.0
Explanation / Answer
I will solve all3 questions taking trial #1
1.
charge = 6.168*10^-9 C
Number of electron = total charge /charge of each electron
= 6.168*10^-9 C / (1.6*10^-19 C)
= 3.855*10^10 Electrrons
2.
Charge on each pitch ball is as you have calculated = 6.168*10^-9 C
3.
F = k*q1*q2./r^2
= (9*10^9)*(6.168*10^-9) *(6.168*10^-9 C) / (4*10^-2)^2
= 2.14 N
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