Which property does not apply to a motor? a. it uses an electromagnet. b. the direction of current changes twice during the rotation of the coil. c. it converts electrical energy into mechanical energy. d. it converts mechanical energy into electrical energy. e. it uses an outside source of electrical c

D. It converts mechanical energy into electrical energy.

Explanation:

Ok lets disregard the whole "oh yay physics explainations" and look at this with just a little common sense and use some elimination and logic.

C and D are pretty similar so just look at those two.

C. It converts electrical energy into mechanical energy.

D. It converts mechanical energy into electrical energy.

Think about what a motor is in something like a fan. How is it powered? ELECTRICITY! So it must convert electricity to mechnical neergy so therefore D must be incorrect.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.