The direction of the electric field based on the information given about the dipole is along the x axis.
It should be noted that a dipole simply means a pair of opposite charges that are separated by a distance.
By default, the direction of the dipole is always from the negative charge -q to the positive charge q.
In this case, since the equipotential surfaces are planes parallel to the YZ planes., the direction of the electric field is along the x axis.
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Complete question:
A dipole with its charges,-q and +q located at the points (0,-b,0) and (0+b,0) is present in uniform electric field E whose equipotential surfaces are planes parallel to the YZ planes.
What is the direction of the electric field?