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Electric field lines
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Jun 10, 2025
This tutorial is about electric field lines
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0:01
this tutorial is about electric field
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lines now field line gives the
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geometrical description of electric
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field to understand the concept of
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electric field let us consider a single
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point charge
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Q situated at the
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origin now electric field due to this
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charge Q would be
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a = 1
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upon 4
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piil q upon
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r² R
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cap now we can now draw Vector pointing
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along the directions of electric field
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with length of these vectors
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proportional to the field at each point
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so let us
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draw these vectors
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along each possible
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Direction now since electric field Falls
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of like 1 upon r² this Vector goes
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shorter and shorter as we goes away from
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the origin pointing in a radially
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outward Direction now if we connect a
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these Vector to form a line we get a
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nicer way to represent this field and
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thereby forming the field lines that is
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what we have to do
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is connect these
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vectors to
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form field lines
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now the magnitude of field is indicated
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by density of these field lines and the
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magnitude is stronger near the center
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where the field lines are closer
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together and it becomes weak as we moves
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outwards as field lines are relatively
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apart at outer points so we can now
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conclude that electric field lines
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are imaginary line
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that are drawn in such a way that its
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direction at any point is same as the
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direction of field at that point now
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electric field of a single negative
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charge would point in a radial inward
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Direction terminating at the charge now
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in general for a configuration of
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charges and electric field lines is a
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curve drawn in such a way that tangent
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to it at any point is in the direction
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of the net field at that
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point so we have seen how to draw field
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lines for a single positive and a
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negative
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charge we can also draw field lines
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around a system of two positive charges
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and this
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figure shows the electric field
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lines due to two
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positive
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charges and from this figure we can see
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that field lines along a system of two
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positive charges describe the mutual
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repulsion between these two charges and
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this figure shows the electric field
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lines due to a positive and a negative
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charge and from this we can clearly see
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that electric field lines around the
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system of a negative and a positive
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charge describes the mutual interaction
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between these two
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charges now some important General
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properties of field lines
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are field lines start from positive
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charge and end on a negative charge
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now two field lines
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never cross each
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other because if they do so then at the
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point of interaction there will be two
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direction of electric fields which is
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impossible now electric field lines
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never pass through a
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conductor and this shows that electric
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Fields inside the conductor is always
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zero
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and electric field lines are always
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continuous
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curve in a charge free region
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sh
#Physics
#Primary & Secondary Schooling (K-12)
#Science