Lecture_3

# Lecture_3 - 18.7 Electric Field Lines So a charged object...

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18.7 Electric Field Lines So a charged object fills all space with an electric field. Can we visualize the field??? Yes!!! And we can do this by using a positive test charge . Let’s start simple and try to map out the field lines around a positive point charge: + + Move the test charge around the point charge and note the direction of the force on it. + + + + Continue this process: + *Notice that the force vector arrows get shorter as we go rther away from the charge 1 farther away from the charge, since the force gets smaller. Now let’s connect the arrows!!!. ..

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E *The electrical field lines of a positive point charge point radially outward away from the charge and fill all space. + y gp Spherical in 3 dimensions!!! By a similar construction, we can show at the field lines around a egative - that the field lines around a negative point charge look like this: 2 i.e. the field lines around a negative charge point radially in toward the charge.
Electric field lines always start at and are directed away from positive harges and always end at and are directed toward negative charges charges and always end at and are directed toward negative charges . But what would the electric field look like in a region of space with more than one charge??? Consider an electric dipole : Two equal but opposite charges separated by some distance r.

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Lecture_3 - 18.7 Electric Field Lines So a charged object...

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