If a DC motor has its armature and field connected across a resistor when the motor is disconnected from its power supply, what statement is true?

Correct Answer: Option D — The motor will slow down by the process of dynamic braking.

Dynamic braking stops a DC motor by disconnecting it from the power source and connecting its armature across a resistive load while keeping the field excited. The motor acts as a generator, converting kinetic energy into electrical energy dissipated as heat through the resistor, quickly halting rotation.