- #1
Dr. S
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Homework Statement
Two 3.0g spheres on 1.0m-long threads repel each other after being equally charged, as shown in the figure.
Homework Equations
F = k*q1*q2/r2
The Attempt at a Solution
sin 70° = Ty/T
T = (m*g)/sin 70°
T = 0.003*9.81/sin 70°
T = 0.03132 N
Tx = T*cos 70°
Tx = (0.03132)*cos 70°
Tx = 0.01071 N
Since both objects experience this force, the force is doubled at 0.02142 N.
1/2*r = sin 20°
r = 0.6840 m
T2x = k*q2/r2
q = (T2x*r2/k)1/2
q = [(0.02142)(0.6840)2/(8.99*109)]1/2
q = 1056 nC = 1.056* 10-6 C
Where am I going wrong?