Force due to a Dipole

I’ve been trying to answer the following question, without success. Can someone help me here?

A \lq\lq pure \rq\rq dipole is located at the origin and is directed to the +z-axis. a)Calculate the force on a point charge q at (0,a,0). b)Calculate the force on q if it is at (a,0,0). c)Calculate the work needed to move q from (0,a,0) to (a,0,0)

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