A 0.80-?m-diameter oil droplet is observed between two parallel electrodes spaced 11mm apart. The droplet hangs motionless if the upper electrode is 32.0V more positive than the lower electrode. The density of the oil is 885kg/m3.What is the droplet's mass?What is the droplet's charge?Does the droplet have a surplus or a deficit of electrons? How many?

Answer

Given,

diameter of oil droplet = 0.8 μ m

space between electrodes,d = 11 mm

density of oil = 885 kg/m³

mass of the oil droplet

mass = density x volume

Charge of the droplet = ?

Electric field expression,

Using the equation of Force

q E = m g

charge of the droplet will be negative.

now,

we know,

q = n e

The droplet has 5 surplus electron.

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

what is the actual question though?