The torque speed characteristic of a Repulsion motor resembles which of the following dc motor characteristic?

Which type of motor is most suitable for computer printer device?

The energy stored in the magnetic field of solenoid $$30$$ $$cm$$ long and $$3$$ $$cm$$ diameter wound with $$1000$$ turns of wire carrying a current of $$10$$ $$A$$ is

If v, w, q stand for voltage, energy and charge, then v can be expressed