What will happen if you reverse both the...

🔍 Key Concepts

• DC propulsion motor basic theory – how field windings and armature work together to set rotation • Effect of reversing current in only the armature vs only the field vs both at the same time • Relationship between direction of magnetic field and direction of armature current in determining rotation

💭 Think About

• Think about what determines the direction of torque in a DC motor: is it the direction of current in just one part, or the interaction between two magnetic fields? • Consider three cases separately in your mind: reverse ONLY the armature, reverse ONLY the field, and then reverse BOTH. In which cases would rotation reverse? • For each answer choice, picture what physically happens inside the motor (magnetic field, force on conductors, brush/commutator behavior). Which options describe a real, expected effect, and which sound unlikely or extreme for this simple change?

✅ Before You Answer

• Recall the right‑hand rule or motor rule: torque direction depends on both field direction and armature current direction. • Verify which changes would realistically cause overheating of brushes versus simply changing electrical polarity. • Ask yourself: if both the field and armature polarities are flipped together, does their relative orientation change or stay the same?

What will happen if you reverse both the field and the armature connections of a DC propulsion motor?

the direction of motor rotation will change

the brushes will become overheated

a magnetic lock will occur in the motor

the direction of motor rotation will remain the same

🔍 Key Concepts

💭 Think About

✅ Before You Answer