Answer:
The net charge is
Solution:
As per the question:
Mass of the plastic bag, m = 12.0 g =
Magnitude of electric field, E =
Angle made by the string,
Now,
To calculate the net charge, Q on the ball:
Vertical component of the tension in the string,
Horizontal component of the tension in the string,
Now,
Balancing the forces in the x-direction:
(1)
Balancing the forces in the y-direction:
where
g = acceleration due to gravity =
Thus
Use T = 0.1357 N in eqn (1):