Lesson_2.2_Printable_PPT

# Lesson_2.2_Printable_PPT - Electric Field A field is a...

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Unformatted text preview: Electric Field A field is a three dimensional space where a force can be detected. Force between two objects whether it is electrical, magnetic or gravitational can be explained using the concept of field. For example, the space around the earth where the gravitational pull of the earth is felt on an object is called the gravitational field of the earth An object of mass m has a weight mg because of the gravitational pull on it. In the same way there is space around an electric charge where it exerts force on other electric charges. This space is called the electric field of that charge. A positive charge attracts a negative ++ ++ charge because the negative charge is in the field of the positive charge.--- http://www.falstad.com/vector3de / Intensity of electric field The magnitude of the electric field at a pointy is called the intensity of electric field or the strength of the electric field. Electric field is a vector quantity which has a magnitude and a direction . e represent electric field by We represent electric field by E . The intensity of electric field E at a point is defined as the force experienced per unit test charge placed at that point. Electric field at a point is a vector quantity, it has a magnitude and a direction ++ ++ Q q o r q o is a test charge placed at Pat a distance r from a charge Q. Using Coulomb’s law the force on q o is: 2 Qq F k r = P The force experienced by unit charge placed at P is: o F q 2 kQ r = This is a measure of the electric field E at the point P due to the charge on Q. 2 kQ E r = E is measured in NC-1 If a charge q coulombs is placed in an electric field E NC-1 , what will be the force on the charge? By definition, E is the force on 1 C of charge. Force on q coulombs of charge is: F = qE http://www.colorado.edu/physics/2000/waves_part icles/wavpart2.html The charge q will accelerate under the action of this net force that can be measured. Direction of an electric field: The direction of an electric field is the direction in which a positive test charge would move . Since a positive charge will move away from a positive charge, the field due to a positive charge is directed away from it. The field due to a negative harge is directed towards it. ++ ++------ charge is directed towards it. Electric Field Lines The intensity and direction of an electric field can be better understood by drawing lines of force called field lines . A line of force is the path taken by a positive test charge placed in the field. Since a positive charge always moves away from a positive charge and towards a negative charge , lines of force are always directed away from a positive charge and towards the negative charge. The following are some of the properties of field lines....
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Lesson_2.2_Printable_PPT - Electric Field A field is a...

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