Answer:
Mass of the oil drop, 
Explanation:
Potential difference between the plates, V = 400 V
Separation between plates, d = 1.3 cm = 0.013 m
If the charge carried by the oil drop is that of six electrons, we need to find the mass of the oil drop. It can be calculated by equation electric force and the gravitational force as :


, e is the charge on electron
E is the electric field, 


So, the mass of the oil drop is
. Hence, this is the required solution.
Answer:
45 m
Explanation:
Use Big Five #5 with v0 = 0 (calling down the positive direction).
Low frequency, low amplitude, or both.
Two forces:gravity and the support force that apposes it