College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 18, Problem 62PE
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 μm in radius and have a density of 920 kg/m3:
- 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.
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An oil droplet is sprayed into a uniform electric field of adjustable magnitude. The
0.0400g droplet hovers motionless when the electric field is set to 370N/C and
directed downward.
a. What was the charge of the oil droplet in Coulombs?
b. Determine the approximate number of excess or defecit electrons on the droplet.
V is the energy (in J) required to bring the two charges from infinite distance separation to distance r (in nm).Q1 and Q2 are the charges in terms of electrons.(i.e. the constant in the above expression is 2.31×10-19 J nm electrons-2)
For a group of "point" charges (e.g. ions) the total energy of interaction is the sum of the interaction energies for the individual pairs.
Calculate the energy of interaction for the square arrangement of ions shown in the diagram below.
Chapter 18 Solutions
College Physics
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