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Charges on Large and Parallel Conducting Plates

What were the...

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What were the forces involved in the calculations made by Millikan in his oil drop experiment

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Solution

The Oil Drop Experiment. In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron. They suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitationalforce with upward drag and electricforces.

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Q. Explain Millikan oil drop experiment in simple ways?

Q. The oil drop experiment by R.A. Millikan was performed to find________.

Q. Why are electrons attached to the oil drops in Millikan experiment?

Q. Assume that Millikan performed the oil drop experiment. In the oil drop experiment, the following charges(in arbitrary units) were found on a series of oil droplets. Calculate the magnitude of the charge on the electron.
(a) 1.6 × 10-¹9 C
(b) 4 × 10-¹5 C
(c) 2 × 10-¹9C
(d) 2 × 10-¹5 C

Q. In 1909, Robert Millikan was the first to find the charge of an electron in his now-famous oil-drop experiment. In that experiment, tiny oil drops were sprayed into a uniform electric field between a horizontal pair of oppositely charged plates.The drops were observed with a magnifying eyepiece, and the electric field was adjusted so that the upward force on some negatively charged oil drops was just sufficient to balance the downward force of gravity. That is, when suspended, upward force qE just equaled mg. Millikan accurately measured the charges on many oil drops and found the values to be whole number multiples of

1.6 \times 10^{- 19} C

the charge of the electron. For this, he won the Nobel prize. Extra electrons on this particular oil drop (given the presently known charge of the electron) are :

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