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Homework Statement:
 see attached picture
Relevant Equations:
 E = kQ/R
a) Should be pretty straight forward, from the equation E = kQ/R , we see that scaling is simply 1/R.
b) Here is gets a bit trickier. We know that q acts as a source (Efield points outwards) and q acts as a sink (Efield points inwards). If the distance is far away do we consider the Q1 and Q2 to be close enough that they cancel out each other? It doesn't seem to be correct in regards to the given answers.
c) 
The solution to the problems are:
a) 1/R
b) 1/(R^3)
c) 1/(R^2)
b) Here is gets a bit trickier. We know that q acts as a source (Efield points outwards) and q acts as a sink (Efield points inwards). If the distance is far away do we consider the Q1 and Q2 to be close enough that they cancel out each other? It doesn't seem to be correct in regards to the given answers.
c) 
The solution to the problems are:
a) 1/R
b) 1/(R^3)
c) 1/(R^2)
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