1. Two spheres separated by 0.06 m carry charges of +50 mC each. Calculate the force between them. What type of force is it? Ans: 6250N, repulsive
2. Two identical charges exert a force of +0.224 N when they are 50 cm apart. What is their magnitude? Ans: 2.49 mC
3. When a sphere carrying an unknown charge is placed 10 cm from a similar sphere carrying a charge of +2 m C, a 0.27 N, attractive, force is observed. Calculate the magnitude and sign of the unknown charge. Ans: -0.15 mC
4. Find the resultant force on the +2 mC charge. Ans: 0.052 N, right

   

5. Find the resultant force on the -6 m C charge in number four. Ans: 0.022 N, left
6. Find the resultant force on the +10 mC charge in number four. Ans: 0.030 N, left
7. Find the resultant force on the +5 mC charge. Ans: 18.31 N, -10.62 ° or 349.38°

   

8. Find the resultant force on the -4 mC charge. Ans: 19.1 N, 174°

   

9. Find the resultant force on the +10 mC charge. Ans: 18.97, -71.6 ° or 288.4°

   

10. Find the resultant force on the +6 mC charge. Ans: 3.73 N, -150.41° or 209.59°

Electrostatics Sample Problems