Calculate the magnitude of the electric field 2.00 m from a point charge of 5.00 mC (such as found on the terminal of a Van de Graaff).What is the magnitude and direction of the force exerted on a 3.50 μC charge by a 250 N/C electric field that points due east?.What is the magnitude and direction of an electric field that exerts a 2.00 × 10 −5 N upward force on a −1.75 μC charge?.(The field was created by a positive charge and here acts on a negative charge.) The charges in this example are typical of common static electricity, and the modest attractive force obtained is similar to forces experienced in static cling and similar situations. The force is attractive, as expected for unlike charges. Using Coulomb’s law, F=k\frac\\īecause q is negative, the force is directed opposite to the direction of the field. In the same way, the Coulomb force field surrounding any charge extends throughout space. For example, the gravitational field surrounding the earth (and all other masses) represents the gravitational force that would be experienced if another mass were placed at a given point within the field.
Concept of a FieldĪ field is a way of conceptualizing and mapping the force that surrounds any object and acts on another object at a distance without apparent physical connection. The force field carries the force to another object (called a test object) some distance away. It is very useful to think of an object being surrounded in space by a force field. Action at a distance is a force between objects that are not close enough for their atoms to “touch.” That is, they are separated by more than a few atomic diameters.įor example, a charged rubber comb attracts neutral bits of paper from a distance via the Coulomb force. They interact through forces that include the Coulomb force.
Calculate the force exerted on a test charge by an electric field.Describe a force field and calculate the strength of an electric field due to a point charge.By the end of this section, you will be able to:
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