Answer:
Mass of the oil drop, [tex]m=3.01\times 10^{-15}\ kg[/tex]
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 :
[tex]qE=mg[/tex]
[tex]m=\dfrac{qE}{g}[/tex]
[tex]q=6e[/tex], e is the charge on electron
E is the electric field, [tex]E=\dfrac{V}{d}=\dfrac{400}{0.013}=30769.23\ V/m[/tex]
[tex]m=\dfrac{6\times 1.6\times 10^{-19}\times 30769.23}{9.8}[/tex]
[tex]m=3.01\times 10^{-15}\ kg[/tex]
So, the mass of the oil drop is [tex]3.01\times 10^{-15}\ kg[/tex]. Hence, this is the required solution.
