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No it is not correct. You are still applying @100v to the motor.
When a motor spins slower it uses more current the 4000 rpm current should be much lower than the 2000 rpm current.
You will have a lower voltage at 2000 rpm though due to the batteries internal resistance, resistance in your speed controller, and the resistance in the cables supplying the power, so it is possible that at 2000 rpm you would have half of the voltage but that is also a sign that you need to fix something.
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