1. Consider 2 spheres with equal but opposite charge. One sphere hangs from the
ID: 1556556 • Letter: 1
Question
1. Consider 2 spheres with equal but opposite charge. One sphere hangs from the ceiling by an insulating cord. The other has a mass of 0.05 kg and levitates directly below the other so that there is a distance 2.5E-3 m between the centers of the spheres. What is the charge on the positively charged sphere?
2. You rub a balloon on your shirt and bring it close to the ceiling and it rises and sticks to the ceiling. Which of the following could be true?
The ceiling was neutral and the balloon was negatively charged.
The ceiling and the balloon had opposite charges.
The balloon was neutral and the ceiling was negatively charged.
The ceiling and the balloon had the same charge.
The balloon was neutral and the ceiling was positively charged.
The ceiling was neutral and the balloon was positively charged.
The ceiling and the balloon were neutral.
Explanation / Answer
1. on levitating sphere,
Fnet = 0
Fnet = Fe - m g = 0
k q^2 / r^2 = m g
(9 x 10^9) (q^2) / (2.5 x 10^-3)^2 = 0.05 x 9.8
q = 18.5 x 10^-9 C
2. The ceiling was neutral and the balloon was negatively charged
The ceiling was neutral and the balloon was positively charged.
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