SOLUTION: In the diagram, q1 = +6.39*10^-9 C. The electric field at point P is zero. What is the value of the charge q2? Q1_______P___________ Q2 •—————•———————

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Question 1151558: In the diagram, q1 = +6.39*10^-9 C. The electric field at point P is zero. What is the value of the charge q2?
Q1_______P____________Q2
•—————•———————-•
|->.424 m<-| |—>.636 m<—|
Answer by ikleyn(52754) About Me  (Show Source):
You can put this solution on YOUR website!
.

Your basic equation is


    Q%5B1%5D%2FR%5B1%5D%5E2 = Q%5B2%5D%2FR%5B2%5D%5E2   (from the Coulomb law). 


You have all the data to complete your calculation.


Substitute and find Q%5B2%5D.

------------

Note:   Q%5B2%5D is positively charged.

On Coulomb law see this Wikipedia article 

    https://en.wikipedia.org/wiki/Coulomb%27s_law