Which changes in an electric motor will make the motor stronger? Choose three correct answers.

A motor becomes stronger when the magnetic forces acting on its electromagnet increase. Increasing the current in the electromagnet strengthens its magnetic field, and using a stronger permanent magnet increases the magnetic field around it. Decreasing the distance between the magnets also makes their magnetic interaction stronger. So the correct changes are increasing current, using a stronger permanent magnet, and decreasing the distance between the magnets.

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