What purpose did the electrically charged plates have in the oil drop experiment?

What purpose did the electrically charged plates have in the oil drop experiment? The droplets entered the space between the plates and, because they were charged, they could be controlled by changing the voltage across the plates. Initially, the oil drops were allowed to fall between the plates with the electric field turned off.

What is the purpose of the electron gun in the Millikan oil drop experiment? This is the original equipment used by Robert Millikan and Harvey Fletcher in 1909 at the Univeristy of Chicago to measure the electric charge on a single electron. With incredible perserverence, they were able to determine the charge to within 1% of the currently accepted value.

Why did an electric field make the oil drops float in mid air? The electric field produced in the bottom chamber by this voltage would act on the charged oil drops; if the voltage was just right, the electromagnetic force would just balance the force of gravity on a drop, and the drop would hang suspended in mid-air.

What did electrons from the ionized do to the oil drops? When the space between the metal plates is ionized by radiation (e.g., X-rays), electrons from the air attach themselves to the falling oil droplets, causing them to acquire a negative charge. The mass of a single charged droplet can be calculated by observing how fast it falls.

What purpose did the electrically charged plates have in the oil drop experiment? – Related Questions

Why was the negative plate earthed in Millikan’s oil drop experiment?

On the other side, this capacitor is being charged to a very high voltage. In such cases, it is suggested to have a discharge path on one of the terminals or plates in order to avoid damage to either humans or equipment as well. Therefore, the negative plate is earthed.

What did Millikan discover about the electron?

Robert Millikan’s oil-drop experiment. By comparing applied electric force with changes in the motion of the oil drops, he was able to determine the electric charge on each drop. He found that all of the drops had charges that were simple multiples of a single number, the fundamental charge of the electron.

What is the principle of Millikan’s oil drop experiment?

The principles are: An oil drop will fall through air under its own weight. If the drop is given a charge, it can be suspended using an electric field. At this point the electrostatic force balances the weight of the drop.

What made the oil drops then move upward?

A specific type of oil is sprayed into the chamber, where drops become electrically charged. The field was turned on and, if it was large enough, some of the drops (the charged ones) would start to rise. This is because the upwards electric force, FE, is greater for them than the downwards gravitational force, g.

What forces act on an oil droplet?

A spherical drop of oil, falling through a viscous medium like air, will quickly reach a constant velocity. When it reaches this equilibrium state, the viscous force is balanced by other forces acting on the drop, such as gravity, buoyant forces from the air, electrical forces, etc.

Why in Millikan’s oil drop experiment the charge measured was always found to be of some discrete value and not any arbitrary value?

How does the electric flux, electric field enclosing a given charge vary when the area enclosed by the charge is doubled? Why in Millikan’s Oil Drop experiment, the charge measured was always found to be of some discrete value and not any arbitrary value? Ans: Because charge is always quantized ie., Q = n x e. 4.

What was used to cause the oil drops to pick up electrons?

The X-rays ionized the air, causing electrons to attach to the oil drops. The oil drops picked up static charge and were suspended between two charged plates.

Can oil be ionized?

For vegetable oil, plentiful of the unsaturated triacylglycerol molecules are ionized when breakdown happens. The molecules in the oil can be divided into two parts: low ionization potential molecules with the number density and high ionization potential molecules with the number density .

Why is Millikan’s apparatus surrounded by a double walled constant temperature enclosure?

The apparatus consists of the doubled walled hollow apparatus where cold water is kept to maintain the constant temperature. The constant temperature must be maintained to maintain the constant coefficient of viscosity since the coefficient of viscosity is dependent on temperature.

What is the significance of the fact that the droplets carried different charges?

a) What is the significance of the fact that the droplets carried different charges? The droplets carry different total charges because there may be 1,2,3 or more electrons on the droplet.

What did Millikan discover about the atom?

Millikan discovered that there is a fundamental electric charge—the charge of an electron. Rutherford’s gold foil experiment showed that atoms have a small, dense, positively charged nucleus; the positively charged particles within the nucleus are called protons.

What did Robert Millikan discover about the electron quizlet?

What did Robert Millikan discover about the electron? The charge and the mass of the electron. The charge on each drop was always some multiple of a single very small value, which he proposed to be the fundamental unit of charge carried by each e-.

What did Millikan conclude after his oil drop experiment?

What did Millikan conclude after performing his oil-drop experiment? The charge on any oil drop is an integral multiple of the charge on an electron. the charge and mass of the atom must be concentrated in a very small volume.

What is the acceleration of the oil drop when it is falling downward?

At terminal velocity, the drag force is balanced by the downward gravitational force and the upwards bouancy force. 6πηrv=4πr33(ρoil−ρair)g. Here ρoil=900 [kg/m³] and ρair=1.2922 [kg/m³] are the densities of oil and air, and g=9.81 [m/s²] is acceleration of gravity.

Who did the oil drop experiment?

Robert Millikan’s famous oil drop experiment, reported in August 1913, elegantly measured the fundamental unit of electric charge.

What important fact did Millikan’s experiment established?

Millikan’s experiment established that ‘electric charge is quantised’ that means the charge present on any object is an integral multiple of charge of an electron.

When the net force on an oil drop in a Millikan apparatus is zero?

When the net force on an oil drop in a Millikan apparatus is zero, the gravity downward cancels the product of the mass and the electric field on the oil drop.

Why did Millikan use oil instead of water?

Professor Millikan has made several innovations to improve the experiment. First, droplets of oil are used instead of water, to reduce the tendency of the droplets to evaporate while the experiment is being performed. was later traced to the fact that Millikan’s value of the viscosity of air had been a little low.

Which of the following charges on an oil drop was determined by Millikan in his experiment?

Oil drop experiment. Millikan used the information to calculate the charge of an electron. He determined the charge to be 1.5924×10−19C, where C stands for coulomb, which is one ampere/second.

What causes their rate of fall to vary from their rate in the absence of an electric field?

The gravitational force and the electrostatic force are acting in the opposite directions which causes the rate of fall of oil drops in presence of electric field to vary from the rate of fall of oil drops in absence of electric field.

Which liquid is used in Millikan oil drop experiment?

Ernest Z. Millikan used vacuum pump oil for his experiment.