Practice Problems
Practice Problems
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 1. An electron has a charge of magnitude 1.6 x 10-19 C. How many electrons does it take to produce a charge of 1 C?   Answer (35.0K) 2. Two positive charges of magnitude 5.0 x 10-6 C and 6.0 x 10-6 C are separated by a distance of 0.03m. Calculate the Coulomb force between the two charges, and give its direction.   Answer (38.0K) 3. A positive charge of magnitude 3.0 x 10-8 C and a negative charge of magnitude 4.0 x 10-8C are separated by a distance of 0.02 m. Calculate the Coulomb force between the two charges and give its direction.   Answer (38.0K) 4. What electric field does the positive charge in the previous problem experience due to the presence of the negative charge?   Answer (35.0K) 5. A uniform electric field of magnitude 30 N / C is directed downward. What are the magnitude and the direction of the force on a + 4.0 C charge placed in this electric field?   Answer (35.0K) 6. What are the magnitude and the direction of the force on a - 3.0 C charge placed in the electric field in the previous problem?   Answer (34.0K) 7. A charge of + 4.0 C is moved a distance of 0.50 m in a uniform electric field of magnitude 30 N / C. Calculate the work done on this charge by the electric field.   Answer (37.0K) 8. The potential energy of a 3.0 x 10 -6 C charge changes from 0.02 J to 0.08 J when it is moved from point 1 to point 2. Calculate the change in the electric potential between these two points.   Answer (44.0K) 9. A charge of magnitude -3.0 x 10-6 C is moved through a potential difference of 80 volts. Calculate the work done on the charge.   Answer (45.0K) 10. A charge of magnitude - 4.0 x 10-6 C is moved through a potential difference of 70 volts. Calculate the work done on the charge.   Answer (45.0K)