Part C. In Millikan’s experiment, the oil droplets acquire one or more negative charges by combining with the negative charges that are produced from the ionization of air by X rays. By measuring the charges on the oil droplets, he calculated the charge on a single electron as −1.60 × 10 − 19 C . The charge on any negatively charged oil droplet is always a whole-number multiple of the fundamental charge of a single electron. If Millikan was measuring the charge on an oil droplet with 10 negatively charged electrons on it, what charge would he have measured on the droplet?
Express your answer to three significant figures and include the appropriate units.
The Millikan oil drop experiment was a direct and convincing experiment for the measurement of the charge on a single electron. Millikan performed an experiment on a charged oil droplet. By balancing the forces acting on the oil droplet, the charge on a single electron can be calculated. Millikan found that the charge of an oil droplet is always a whole-number multiple of
−1.60 × 10−19 C. Thus, the charge on a single electron is −1.60 × 10−19 C.
Various types of forces that are observed in nature
You can observe the following types of forces in nature:
1. The attraction or repulsion between objects or particles that have electrical charge is known as the electric force.
2. The force with which the Earth, the Moon, or any other massively large object attracts another object toward itself is known as the gravitational force. 3. The force exerted upon an object that is in contact with another stationary object is known as a normal force.
4. The special type of frictional force that acts upon objects as they travel through the air is known as an air resistive force.
5. The force exerted by a compressed or stretched spring upon any object that is attached to it is known as a spring force.
6. The upward force caused by the air pressure that keeps things afloat is known as a buoyant force.
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