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chemistry-the-centrals chemistry.the central.scien × sers/milkl/Desktop/chemistry_the central science 14th edition.pdf H-C-C-CC-C H-C-C-H 2.10 In the Millikan oil-drop experiment (see Figure 2.5), the tiny oil drops are observed through the viewing lens as rising, stationary, or falling, as shown here. (a) What causes their rate of fall to vary from their rate in the absence of an electric field? (b) Why do some drops move upward? [Section 2.2] The following exercises are divided into sections that deal with specific topics in the chapter. The exercises are grouped in pairs, with the answers given in the back of the book to

Explanation / Answer

The oil drops are allowed to fall between the plates in the absence of electric field. Due to gravity they accelerate first, but gradually slowdown because of air resistance.

If the applied electric force is greater than the downward forces, some of the drops (the charged ones) will start to rise. Now the electric force will act upwards,gravity and viscous forces acts downwards.

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