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Electrostatics Sample Problems

  1. A +6 mC and a +3 mC charge are separated by 0.03 m. What is the magnitude and the direction of the electrostatic force between them?
  2. A repulsive force of 220 N exists between an unknown charge and a charge of +4.7 mC. If they are separated by 2.5 cm, what is the magnitude and sign of the unknown charge?
  3. Two protons are separated by 1 x 10-11 m. What is the magnitude of the electrostatic force between them?
  4. A +4 mC charge lies 2 m to the left of a -5 mC charge. A -6 mC charge lies 4 m to its right. What is the magnitude and the direction of the resultant force on the center charge?
  5. In number four, what is the magnitude and direction of the resultant force on the +4 mC charge?
  6. Three charges form a right triangle. A -3 mC charge is 4 cm above a +6 mC charge. A +1.5 mC charge is 3 cm to the right of the +6 mC charge. What is the magnitude and direction of the resultant force on the +6 mC charge?
  7. Now find the resultant force on the +1.5 mC charge.
Electrostatics Notes

Electrostatics Homework