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Millikan's Oil Drop Experiment

Millikan's oi...

Question

Millikan's oil drop experiment was conducted to find:

A

Mass of an electron

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B

Charge on an electron

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C

Mass of proton

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D

Charge of a proton

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Solution

The correct option is B Charge on an electron
Millikan performed the oil drop experiment to measure the elementry electric charge, i.e., charge of the elctron.

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(What Millikan did was to put a charge on a tiny drop of oil, and measure how strong an applied electric field had to be in order to stop the oil drop from falling.)

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. If a drop of mass

1.08 \times 10^{- 14} k g

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1.68 \times 10^{5} N C^{- 1}

, then the charge of this drop is :

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Millikan's Oil Drop Experiment

Standard XII Chemistry

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