if an Oil Drop of a 3.2 *10 to the power minus13 N is balanced in an electric field of 5*10 to the power 5 v/m . find the charge on the oil drop?
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Answer:
F = E * Q where E is the electric field and Q the charge
Q = F / E = 3.2 * 10E-13 / 5 * 10E5 = 6.4 * 10E-19 C
this will not give you the value of the elementary unit charge
which is 1.6 * 10E-19
Many measurements need to be made giving Q = n *e
and then determining the integral (integers) values for n that are consistent with the measurements because different drops will different numbers of charges on them
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