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

In a DC series motor, what is the relationship between speed and armature current? 

1
Speed is independent of armature current. 
2
Speed is directly proportional to armature current. 
3
Speed is directly proportional to the square of armature current. 
4
Speed is inversely proportional to armature current. 
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