In what type of application would a permanent magnet dc motor be highly suitable? (select all that apply) 1. you need a linear torque-speed curve 2. you need relatively high energy efficiency in a dc motor 3. you need to run the dc motor at speeds over 4000 rpm 4. you have very little space with which to package the dc motor 5. you need a very low cost dc motor, preferably $3 or less.