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Integrated ConceptsThe classic Millikan oil drop
Chapter 18, Problem 62(choose chapter or problem)
Integrated Concepts
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 the gravitational force by a vertical electric field. (See Figure \(18.58\).) Given the oil drop to be \(1.00 \mu \mathrm{m}\) in radius and have a density of \(920 \mathrm{~kg} / \mathrm{m}^{3}\) :
(a) Find the weight of the drop.
(b) If the drop has a single excess electron, find the electric field strength needed to balance its weight.
Figure \(18.58\) In the Millikan oil drop experiment, small drops can be suspended in an
electric field by the force exerted on a single excess electron. Classically, this experiment was used to determine the electron charge qe by measuring the electric field and mass of the drop.
Equation Transcription:
Text Transcription:
18.58
1.00 m
920 kg/m^3
Questions & Answers
QUESTION:
Integrated Concepts
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 the gravitational force by a vertical electric field. (See Figure \(18.58\).) Given the oil drop to be \(1.00 \mu \mathrm{m}\) in radius and have a density of \(920 \mathrm{~kg} / \mathrm{m}^{3}\) :
(a) Find the weight of the drop.
(b) If the drop has a single excess electron, find the electric field strength needed to balance its weight.
Figure \(18.58\) In the Millikan oil drop experiment, small drops can be suspended in an
electric field by the force exerted on a single excess electron. Classically, this experiment was used to determine the electron charge qe by measuring the electric field and mass of the drop.
Equation Transcription:
Text Transcription:
18.58
1.00 m
920 kg/m^3
ANSWER:
Solution