Electric Field Around A Dipole?

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PurelyPhysical
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http://imgur.com/48cLE6q

I can't follow this. Did my teacher make a mistake? Why are all the charges 2?
 
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All the charges are "2" because the problem statement says they are.
Why would you expect anything different?

... anyway - there are three charges in the problem so what are you talking about?
 

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