The force between two identical charges separated by cm is equal to 90 N. What is the magnitude of the two charges

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1. The force between two identical charges separated by 1 cm is equal to 90 N. What is the magnitude 

of the two charges? 

 

3. Find the magnitude and direction of the total electric field at the origin of the coordinate system  

due to the two point charges, q1=5 nC  and q2=10 nC. The two charges are located at the x-y coordinate  

position of (0.0, -2.0 cm) and (+4.00 cm, 0.0), respectively. 

4.