In 1909, Millikan performed a famous experiment in which he measured the charge of the electron (and for which he won the Nobel prize). In his experiment, oil drops carrying excess electrons are made to float between two charged large parallel, horizontal plates, as shown, by adjusting a uniform vertical electric field between the plates so that the drops do not fall down. Suppose each drop has a mass of 3.3 × 10-15kg, and one of the drops floats (the net force on it is zero) when the electric field magnitude is 39,200 N/C. Charged plates Charged plates Drops (a) What is the net charge on this drop, and how many excess electrons does that correspond to? Note that the number of electrons is an integer, but due to experimental uncertainty, the number you initially calculate might not be an integer, so you will need to round! (b) How many electrons total are there in the drop (including all the electrons in the neutral atoms)? Assume that most of the weight of the oil is due to carbon atoms; Each carbon atom has 6 electrons. You will need to look up the atomic weight of carbon.

In 1909, Millikan performed a famous experiment in which he measured the charge of the electron (and for which he won the Nobel prize). In his experiment, oil drops carrying excess electrons are made to float between two charged large parallel, horizontal plates, as shown, by adjusting a uniform vertical electric field between the plates so that the drops do not fall down. Suppose each drop has a mass of 3.3 × 10-15kg, and one of the drops floats (the net force on it is zero) when the electric field magnitude is 39,200 N/C. Charged plates Charged plates Drops (a) What is the net charge on this drop, and how many excess electrons does that correspond to? Note that the number of electrons is an integer, but due to experimental uncertainty, the number you initially calculate might not be an integer, so you will need to round! (b) How many electrons total are there in the drop (including all the electrons in the neutral atoms)? Assume that most of the weight of the oil is due to carbon atoms; Each carbon atom has 6 electrons. You will need to look up the atomic weight of carbon.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.

Question

In 1909, Millikan performed a famous experiment in which he measured the charge of the electron
(and for which he won the Nobel prize). In his experiment, oil drops carrying excess electrons are
made to float between two charged large parallel, horizontal plates, as shown, by adjusting a uniform
vertical electric field between the plates so that the drops do not fall down. Suppose each drop has
a mass of 3.3 × 10-15kg, and one of the drops floats (the net force on it is zero) when the electric
field magnitude is 39,200 N/C.
Charged plates
Charged plates
Drops
(a) What is the net charge on this drop, and how many excess electrons does that correspond to?
Note that the number of electrons is an integer, but due to experimental uncertainty, the number
you initially calculate might not be an integer, so you will need to round!
(b) How many electrons total are there in the drop (including all the electrons in the neutral atoms)?
Assume that most of the weight of the oil is due to carbon atoms; Each carbon atom has 6
electrons. You will need to look up the atomic weight of carbon.

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