R. A. Milikan set up an apparatus (see figure) in which a tiny, charged oil drop

Question

R. A. Milikan set up an apparatus (see figure) in which a tiny, charged oil drop, placed in an electric field could be balanced by adjusting the electric field until the electric force was equal to the weight of the drop. If the radius of the drop is 1.64E-4 cm and at balance the electric field is 1.92E5 N/C,

a) What charge is on the drop?

b) In an early run of this experiment, Milikan observed the following charges on a single drop:

6.653E-19C, 8.204E-19C, 11.50E-19C, 13.13E-19C, 16.48E-19C

What value for the elementarty charge e can be detected from these data?

Explanation / Answer

mg=E*nq m=4/3*pi*r^3*pho pho is not given E,g,r are given.On solving we get nq

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