the%20water%20level%20h(t)%20in%20the%20tank%20given%20in%20figure%20(2)%20is%20controlled%20by%20an%20armature.controlleddcmotorwhosecurrent(ia)turnstheshafttoopenthereservoirvalve.theinductanceofthedcmotorisnegligible(la=0)