The classic Millikan oil drop experiment was the first to obtain an accurate measurement of the charge on an electron. In it, oil drops were suspended against gravity by a vertical elec field. (See figure below.) + + + 9. microscope Assume the oil drop to be 1.20 pm in radius and have a density of 940 kg/m3. (a) Find the weight of the drop in newtons. (b) If the drop has a single excess electron, find the magnitude in newtons per coulombs of the electric field strength needed to balance its weight. N/C
The classic Millikan oil drop experiment was the first to obtain an accurate measurement of the charge on an electron. In it, oil drops were suspended against gravity by a vertical elec field. (See figure below.) + + + 9. microscope Assume the oil drop to be 1.20 pm in radius and have a density of 940 kg/m3. (a) Find the weight of the drop in newtons. (b) If the drop has a single excess electron, find the magnitude in newtons per coulombs of the electric field strength needed to balance its weight. N/C
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Transcribed Image Text:The classic Millikan oil drop experiment was the first to obtain an accurate measurement of the charge on an electron. In it, oil drops were suspended against gravity by a vertical electric
field. (See figure below.)
+
microscope
Assume the oil drop to be 1.20 µm in radius and have a density of 940 kg/m3.
(a) Find the weight of the drop in newtons.
N
(b) If the drop has a single excess electron, find the magnitude in newtons per coulombs of the electric field strength needed to balance its weight.
N/C
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