This consists of two dipoles, −q and +q with dipole moment along with the +y direction and −q and +q along the X-direction 
∴ The resultant moment =q2a2+q2a2=2qa Along the direction 45∘ that is along OP where P is (+a,a,0)
NEET UG 2007 — Physics Electromagnetism
Three point charges +q,−2q are placed at points (x=0,y=a,z=0),(x=0,y=0,z =0) and (x=a,y=0,z=0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are:
Held on 30 Apr 2007 · Verified 9 Jul 2026.
2qa along the line joining points (x=0,y=0,z=0) and (x=a,y=a, z=0)
qa along the line joining points (x=0, y=0,z=0) and (x=a,y=a,z=0)
2qa along +x direction
2qa along +y direction
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