QUESTIONS SET 1: Electrostatics

Show Work by applying the GUESS method. G (write out the given), U (write out the unknown), E (write out the equations), S (substitute numbers with units), S (solve for the unknown).


  1. If 1.0 joule of work is required to move 1.0 coulomb of charge between two points in an electric field, the potential difference between the two points is
    1) 1.0 × 100 V
    2) 9.0 × 109 V
    3) 6.3 × 1018 V
    4) 1.6 × 10–19 V

  2. Which quantity of excess electric charge could be found on an object?
    1) 6.25 × 10–19 C
    2) 4.80 × 10–19 C
    3) 6.25 elementary charges
    4) 1.60 elementary charges

  3. Sketch at least four electric field lines with arrowheads that represent the electric field around a negatively charged conducting sphere.




    (-)


  4. What is the magnitude of the electrostatic force between two electrons separated by a distance of 1.00 × 10–8 meter?
    1) 2.56 × 10–22 N
    2) 2.30 × 10–20 N
    3) 2.30 × 10–12 N
    4) 1.44 × 10–1 N

  5. A 3.00 × 10−9-coulomb test charge is placed near a negatively charged metal sphere. The sphere exerts an electrostatic force of magnitude 6.00 × 10−5 newton on the test charge. What is the magnitude and direction of the electric field strength at this location?
    1) 2.00 × 104 N/C directed away from the sphere
    2) 2.00 × 104 N/C directed toward the sphere
    3) 5.00 × 10−5 N/C directed away from the sphere
    4) 5.00 × 10−5 N/C directed toward the sphere