# How does the length of the z-component of the net dipole moment of ammonia relate to the actual length of the dipole moment vector?

##### 1 Answer

Well, the length is identical. The dipole moment of ammonia is along its

The **principal axis of rotation** (

For instance, the

If you want to visualize this more, click on the image and try out the rotation yourself.

For ammonia, the

The **dipole moment** of ammonia points *exactly* along the

#vecmu = << mu_x, mu_y, mu_z >>#

#= << 0, 0, 1.48 >>#

The **length** of the vector is given by the vector magnitude:

#color(blue)(|| vecmu ||) = sqrt(mu_x^2 + mu_y^2 + mu_z^2)#

#= sqrt(0^2 + 0^2 + ("1.48 D")^2)#

#=# #color(blue)("1.48 D")#