Download 05.E-Field only practice worksheet

E-Field – Practice Worksheet
Name: ___________________
1. In the field mapping exercise you calculated the electric force at various positions from a point
charge. In the diagram below, the electric field vector has been determined at three locations.
Using symmetry considerations, sketch the net electric field vector at the rest of the locations.
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2. Draw the electric field lines around a positively charged plate as shown.
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3. Two large charged plates are shown below. Draw at least six electric field lines inside the plates.
Using a colored marker, draw a positive charge. Show the direction of the positive charge using
the same marker. Repeat with another colored marker for a negative charge.
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- - - - - - - - - - - - 4. Draw the electric field that surrounds the charges given below.
1. A positive charge
2. A negative charge
3.3. Two positive charges and one
negative charge
4. A negative charge and a
positive metallic bar
5. A positive charge and a negative
metallic ring
Practice Problem Solving:
E=F/q
or
F=qE
[Unit of E, (Electric Field) is N/C]
Definition: Electric Field is defined as the force felt by a positive test charge.
1. What is the magnitude of the force on an electron in an electric field of 800N/C?
2. A force of 3.4N is exerted on a -2.8µC charge in a downward direction. What is
the magnitude and direction of the electric field at this point?
3. An electron in an electric field experiences a force of 4.0 x 10-16N. What is the
magnitude and direction of the electric field at this point?
4. What is the relationship between the electric field strength and the charge of the
point source? If the charge of the point source is increased by a factor of
three, what happens to the electric field strength?