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1. The potential energy of a certain system of two charges increases as the charges are moved farther apart. What does
this tell us about the sign of the charges? Why?
2. Show that volt per meter is the same as newton per coulomb.
3. A student said "electric potential is always proportional to potential energy; why bother with the concept of potential at
all? How would you respond?
1. Compute the force of attraction between
a +1.60 x 10 ^-19 C charge and a -2.09 x 10^-18 C charge if they are 4.01 x 10^-10 m apart.
2. Two ball bearings with opposite charges are 1.11 m apart on the floor on the floor. What are their charges if they are attracted to each other with a force of 5.11 N?
3. Compute the electric field experienced by a test charge q =+0.80μC from a source = +0.15μC in a vacuum when the test charge is places 0.20 m away from the other charge.
4. A.
E = 3.4 x 10^23 N/C
A = 2.3 x 10-2m²
Cos = 84⁰
B.
E= 8.2 x 10^5 N/C
A = 6.1 x 10^-7m²
Cos = 90⁰
2 charged particles reacted with a force of 0.31 N with a distance of 1.5 cm, the 2nd charge contains 54 nC. Find the value of the first charge
sphere A carries a positive charge 4Q and sphere B is neutral. Initially the spheres are separated by a distance r. The spheres briefly touched each other and move to the initial separation. what is the new charge on each sphere
:An attractive force of 12kN is experienced by two charges of magnitude 4nC and 7nC. At what
distance must these two charges be to experience this force?
A charge of 6 × 10−7𝐶 is transferred from infinity to point B. If the work
done by the electric force to do this is 1.2 × 10−5𝐽. What is the potential at point
B?
A cube with sides measuring 5cm is place in an electric field with magnitude 3x10^3 N/C.
a. Calculate the flux in each side of the six face of the cube.
b. Calculate the total flux of the cube
An electron (-q= +1.602 × 10-¹9) moves along a straight line from point b with a separation distance of 0.2 m.Considering the electric field along this line is uniform with magnitude of E=300 N/C and directed from points a to b.What is the magnitude of force electron?
A particle with a charge of +5.90 nC is in a uniform electric field E directed to the left.It is released from rest and moves to the left; after it has moved 60.0mm,it's kinetic energy is found to be +3.50 × 10-⁶.What is the potential difference of the starting point with respect to the end? What is the magnitude of electric field?
A particle of charge 3 x 10-9 C is located at point (0,0) in a certain coordinate system. Assuming all lengths are in meters, calculate the potential at the following points: A (3,3) and B (0,2). How much work is needed to take a particle of charge 2 x10-5 C from point A to point B?
