Electrostatics Practice Problems – 18.5
Two oppositely charged particles are held in place near each other. When the
particles are released, they will most likely
A accelerate away from each other.
B accelerate toward each other.
C rotate in a clockwise direction.
D rotate in a counterclockwise direction.
Electrostatics Practice Problems – 18.5
Two like charged particles are held in place near each other and a force F is
measured between them. When the particles are moved four times further apart the
new force measured between them is:
A the same.
B four times greater.
C one sixteenth times less.
D sixteen times greater.
Electrostatics Practice Problems – 18.5
A Beta particles is an electron. Consider two Beta particles held in place separated
by 10.0 cm. The magnitude of the force on one of them is:
A 1.44 x 10 -7 N
B 2.30 x 10 -26 N
C 2.30 x 10 -27 N
D 2.30 x 10 -30 N
qe = 1.60 x 10-19 C
Electron Charge = Beta Particle Charge
Electrostatics Practice Problems – 18.5
Consider an array of four positively charged particles held in place on the vertices
of a square. What direction would the net force on the charge in the upper right
corner point?
A to the right.
B straight downward.
C down and to the left (3rd quadrant)
D up and to the right (1st quadrant)
Electrostatics Practice Problems – 18.5
Consider an array of three protons held in place on the vertices of an equilateral
triangle with 1.00 m length sides. Predict and calculate the net force on the proton at
the top of the triangle.
A 2.96 x 10-26 N @ 270. degrees
B 2.96 x 10-26 N @ 90.0 degrees
C 1.48 x 10-24 N @ 90.0 degrees
D 3.99 x 10-28 N @ 90.0 degrees
Electrostatics Practice Problems – 18.6
Consider a positive point charge held stationary in a region of space. If a second
point charge was brought into the same region of space, what would tell the second
point charge how much force feel?
A The electric energy field.
B The gravitational potential energy field.
C The electric force field created by the first point charge.
D The electric force field created by the second point charge.
Electrostatics Practice Problems – 18.6
Consider a positive point charge held stationary in a region of space. What direction
does the electric force field created by the point charge point?
A Upward.
B The same as the direction of force on a neutral charge.
C The same as the direction of force on any massive object.
D The same as the direction of force on a positive “test” charge.
Electrostatics Practice Problems – 18.6
Consider a negative point charge, q = -56 µC, held stationary at the origin of a
standard Cartesian coordinate system. Predict and calculate the electric force field
at x = 25 cm, y = 0 cm.
A 8.1 x 102 N/C @ 180˚
B 8.1 x 1012 N/C @ 180˚
C 8.1 x 106 N/C @ 0.0˚
D 8.1 x 106 N/C @ 180˚
E 8.1 x 102 N/C @ 0.0˚
Electrostatics Practice Problems – 18.6
Consider a negative point charge, q = -56 µC, held stationary at the origin of a
standard Cartesian coordinate system. Predict and calculate the electric force field
at x = 30 cm, y = 40 cm.
A 2.0 x 106 N/C @ 53˚
B 2.0 x 102 N/C @ 0.0˚
C 2.0 x 106 N/C @ 45˚
D 2.0 x 106 N/C @ 233˚
E 2.0 x 106 N/C @ 180˚