Electricity and Magnetism Answers

A charge experiences a force of 1.5 x 10 -6 N in a uniform electric field of intensity 8.8 N/C. What is the charge?

An electron experiences a force of 8.7 x 10 -12 N. What is the intensity of the electric field?

A positive charge of 2.8 mC experiences a 4.8 x 10 -2 N force when placed in a uniform electric field. What is the magnitude of the electric field?

A positive charge of 6.6 µC and a negative charge of 4.0 µC exert a force of -25.0 N on each other. How far apart are the charges?

Two electrons are separated by a distance of 1.60 m. What is the magnitude of the electric force between them?

A copper bar is cut in half and a rubber plug is placed between the two pieces. A negatively charged rod is touched at Point A. Small pieces of paper are placed at Points B, C, D and E. Which of the following is most likely to happen? The small pieces of paper will stick at ______________.





Select one:

a. B only

b. B, C, and E

c. B, C, D, and E Incorrect

d. C only

If Object A is attracted by and sticks to a negatively charged rod, we can be sure that


Object A _____________

Select one:

a. must be neutral

b. must be positively charged Incorrect

c. could be either neutral or positively charged

d. must be negatively charged

A neutral object becomes negatively charged when rubbed with hair because the neutral object ___________


Select one:

a. gains protons

b. loses electrons Incorrect

c. gains electrons

d. loses protons

Three identical metal spheres are hung from silk threads so that they are isolated from their surroundings. Initially, they are neutral in charge. A positively charged rod is touched to sphere A, sphere A is then touched to sphere B, and sphere B is touched to sphere C. If the charge on the rod was initially 20 C, .




Which of the three spheres has the most protons?


If all three spheres are briefly and simultaneously touched together, then what will be the resulting charge on sphere B?


What is the charge of sphere B after it has been touched to sphere C?



Which of three spheres has the least electrons after sphere B touched to sphere C?



Total charge that is distributed among the 3 spheres?



Charge on sphere A after it is touched to sphere B?


Smallest charge that any of the 3 spheres can have after all of the spheres are carrying a charge?



Charge on sphere C after it has been touched by sphere B?



Charge on sphere A after it is touched by the rod?

How much work is done to transfer 2.6 C of charge through a potential difference of 120 V?