Download Electric Fields Practice Problems

Electric Fields Practice Problems
AP Physics
Name:
Period:
37. At a point in space, an electric force acts vertically downward on an electron. What is the direction of the
electric field at that point in space?
38.
a) How does a vector field diagram show the
magnitude of the electric field in different
locations?
39. a) How does a field line diagram show the
magnitude of the electric field in different
locations?
b) Draw a vector field diagram for the electric field
around a negative point charge. Mark a place with
a strong field with an asterisk (*) and mark a place
with a weak field with an ampersand (&).
b) Draw a field line diagram for the electric field
around a positive point charge. Mark a place with a
strong field with an asterisk (*) and mark a place
with a weak field with an ampersand (&).
40. Can electric field lines ever cross? Why or why not? What would it mean if electric field lines were to
cross?
42. If the distance from a particular location to a charge is doubled, what happens to the magnitude of the
electric field produced by that charge at that location?
43. An isolated electron experiences an electric force of 3.2 x 10-14 N, to the north. What is the electric field at
the electron’s location?
44. What is the magnitude of the electric field at a point 0.25 cm away from a +2.0 C point charge?
45. At what distance from a proton will the magnitude of its electric field by 1.0 x 105 N/C?
46. Two point charges are separated by a distance of 20 cm, the righthand one is –4.0 C and the lefthand one
is –5.0 C.
a) What is the electric field halfway between the charges?
b) What is the electric field at the point between the charges that is 5 cm away from the righthand charge?
80. Find the electric field at point O for the charge configuration shown in the
picture.
49. Three charges are placed in a coordinate plane: a +2.5 C charge is located at (-0.20 m, 0.15 m), a –4.8 C
charge is located at (0.50 m, 0.35 m) and a –6.3 C charge is located at (0, -0.35 m). What is the net electric
field at the origin?
55. Two large (2 m on a side), square metal plates are aligned parallel to each other, with one above the other.
They are then charged oppositely. If the electric field between the plates is 1.7 x 106 N/C pointing up, what is
the charge on each plate?
56. Two square metal plates measure 20 cm on a side. They are charged so that the top plate has +4.0 mC and
the bottom plate has –4.0 mC.
a) What is the electric field between the plates?
b) What force will act on an electron in the region between the plates?