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so i found the torque for 300v and did the following:You know both the torques (at 300V, 30A and at 260V, 30A).

Hint: As I said earlier, torque is proportional to the product of field current and armature current.

T(300) / T(260) = I(f)1 / I(f)2 (as Ia cancel out because they are the same)

and then I(f) = Vdc / Rf + Radj

but i end up getting 20 ohms for my answer which was the same as the original?

What am i doing wrong here?