Answer:
Explanation:
Q1 = 35 nC = 35 x 10^-9 C
m = 3.5 micro gram = 3.5 x 10^-9 Kg
d = 35 cm = 0.35 m
(a) The electrostatic force between the two charges is balanced by the weight of another charge.
F = m g


(b) By substituting the values

Q2 = 13.34 x 10^-12 C
Q2 = 0.0134 nC
They could change but most likely not
Hopefully this will help you.
Do the same for disc. Moment of Inertia of disc about its axis = MR²/2
You answer is b an oscillating wave
A. 1 000 J
▂▄▄▓▄▄▂
◢◤ █▀████▄▄▄▄▄▄ ◤
██
◥█████◤
══╩══╩═