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Applied Physics
PHYS-1121(3)
Dr
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If a second charged particle is located in that space,
an electrostatic force acts on it due to the magnitude and direction of
the field at its location
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(Extended), Halliday, Resnick, Walker

Applied Physics

The electric field intnesity E at any point is defined in terms of the
electrostatic force F that would be exerted on a positive test charge qo
placed there
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The electric field vector at any point is tangent to the
field line through that point
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Thus, closer field
lines represent a stronger field
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So, a field line extending from a positive charge must
end on a negative charge
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(Extended), Halliday, Resnick, Walker

Applied Physics

The electric field E is a vector field as it conveys information about a
force which has magnitude and direction
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(Extended), Halliday, Resnick, Walker

Applied Physics
The terms of force and field have different meanings
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The unit of electric field is newton per coulomb (N/C)
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2) In a
plane perpendicular to the field lines, the
relative density of
the lines represent
the relative
magnitude of the
Source: Fundamentals of Physics 10th Ed
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Applied Physics
The electric field lines extend away from positive charge (where they
originate) and toward negative charge ( where they terminate)
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(Extended), Halliday, Resnick, Walker

Applied Physics
The field lines for two particles with equal positive charges
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(Extended), Halliday, Resnick, Walker

Applied Physics

Electric Field Intensity
The quantification of electric field informs about intensity of electric
field at a particular point
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e
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This is the electric field due to a point charge
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Forces and electric fields obey the principle of superposition and are
added as vectors
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(Extended), Halliday, Resnick, Walker

Applied Physics

Net electric field
Figure 22-7 shows three
particles
with
charges
q1=+2Q, q2=-2Q, and q3=-4Q,
each a distance d from origin
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(Extended), Halliday, Resnick, Walker

Applied Physics
A point charge in an electric field
If a particle with charge q is placed in an external electric field E, an
electrostatic force F acts on the particle: F = qE
If charge q is positive, the force vector is in the same direction as the
vector field
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The electrostatic force F acting on a charged particle located in an
external electric field E has the direction of E if the charge q of the
particle is positive and has the opposite direction if q is negative
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(Extended), Halliday, Resnick, Walker

Applied Physics

Source: Fundamentals of Physics 10th Ed
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2: 4, 5, 6
Module 22
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(Extended), Halliday, Resnick, Walker



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