https://phet.colorado.edu/en/simulation/charges-and-fieldsThe link 

 

Activity 2: The Electric Field due to Two Charges 8. Place two positive charges close to each other in the Charges and Fields PhET simulation. Are there going to be places around the two charges where the electric field is 0? Where would they be if so? 9. Use the simulation to test your prediction. Were you correct? Explain why or why not. 10. Place two negative charges close to each other. Are there going to be places around the two charges where the electric field is 0? Where would they be if so? 11. Use the simulation to test your prediction. Were you correct? Explain why or why not. 12. Place one positive charge and one negative charge close to each other. Are there going to be places around the two charges where the electric field is 0? Where would they be if so? 13. Use the simulation to test your prediction. Were you correct? Explain why or why not.