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Millikan Experiment Quiz

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Questions and Answers

What is the primary purpose of Millikan's experiment?

To calculate the speed of charged particles

To determine the mass of oil droplets

To observe the behavior of electromagnetic fields

To measure the electronic charge (correct)

What effect does the application of an electric field have on a charged oil droplet in Millikan's experiment?

It increases the temperature of the droplet

It can alter the droplet's motion based on the charge (correct)

It causes the droplet to emit X-rays

It eliminates the mass of the droplet

How is the charge on the droplet determined in Millikan’s method?

By measuring the pressure exerted by the droplet

By analyzing the frequency of droplet oscillation

Through the balance of gravitational and electric forces (correct)

Using a mathematical model of droplet size

What role do X-rays play in the determination of electronic charge in Millikan's experiment?

<p>They ionize the air, allowing droplets to acquire charge (A)</p> Signup and view all the answers

What condition must be met for the oil droplet to remain motionless between the plates?

<p>The gravitational and electric forces must be equal (B)</p> Signup and view all the answers

Flashcards

Millikan experiment

An experiment conducted by Millikan to determine the elementary electric charge (e).

Electric charge of oil droplets

The charge acquired by oil droplets from ionizing air particles.

Electric field adjustment

Adjusting the electric field to suspend a charged droplet in mid-air.

Gravitational force

The downward force exerted on an oil droplet due to gravity.

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Electric force

The upward force exerted on a charged droplet due to an electric field.

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Study Notes

Millikan Experiment

Millikan (1910) conducted an experiment to determine the electronic charge.
The experiment utilizes insulated, parallel metal plates.
Plates are charged by a voltage source (V).
Tiny oil droplets are sprayed into the space between the plates.
Oil droplets can pick up positive or negative ions from the air.
X-rays or radioactive sources ionize the air.
Oil droplets can be observed falling through a microscope.
If a droplet is charged and an electric field is applied, the droplet's motion may accelerate, slow, or reverse depending on the charge's sign and magnitude.
Adjusting the electric field will allow the droplet to remain stationary.
Under these conditions, the gravitational force equals the upward electric force.

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Description

Test your understanding of Millikan's experiment to determine the electronic charge. This quiz covers the principles and mechanisms involved, including the role of charged oil droplets and electric fields. Perfect for students studying physics and electricity.