In a diagram of charges and electric field lines charge 
has twelve field lines going outward from it and charge 
has three field lines going into it. If one of the charges is 100 nC, what is the other one?
A. 25 nC
B. 100 nC
C. -25 nC
D. -100 nC
E. Both answers b and c can be correct.
Answer: C
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