railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical Machines DC Motor

What is the mathematical model of armature of DC motor in Laplace Domain? 

1
Va(S) = (Ra + sLa) Ia(s) + Eb(s)
2
Va(S) = (Ra + sLa) Eb​(s) + Ia(s)
3
Va(S) + Ia(s) = (Ra + sLa) Eb​(s) 
4
Va(S) - Ia(s) = (Ra + sLa) Eb​(s) 
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