Question

When the motor below is connected to the battery, the iron bar and copper coil spin in a circle. If no energy is lost as heat and no electrical energy remains after it runs through the coil, how much of the electrical energy flowing through the copper wire is transformed into mechanical energy? A. half of it B. a tiny fraction of it C. none of it D. all of it

Answer 1

If none is lost as heat and there's no electrical left over that means all the energy was transformed into mechanical, so the answer is D