The magnetic field in a long solenoid is
H = IN/l, where
I is current,
N is number of turns,
l is length of solenoid.
I think you can use this, even though the solenoid is not straight.

The B field is
B = [mu]0[mu]rH,
where [mu]0 = 1.2566 * 10-6 Vs/Am.

[mu]r depends on your core material. Furthermore, it depends on how strongly the material is magnetized. OK, if you use a DC of 2 Amps, I should suspect that the core is always fully magnetized. At least in the stator. For iron, you can assume a maximum value of 5500. But be careful here, since other materials can have very different values of [mu]r.

I think the least risky method is, to measure B directly with a Hall probe.

thanks for the help on this problem. Your calculations made sense BUT (ironically and I think I got what I deserved 'coz I started researching so late) our prof gave us the exact formaula to use in our calculations!!!!