An electric motor and an electric generator are devices that only require magnetism. devices that only require magnetism. entirely different devices. entirely different devices. devices they do not use electromagnetic induction. devices they do not use electromagnetic induction. very similar devices.

The both the devices that only require magnetism. entirely different devices.

Explanation:

An electric motor is a device which converts the electrical energy into the mechanical energy. It contains a magnet and the coil is rotated inside this magnetic field due to the application of current.

An electric generator is a device which converts the mechanical energy into the electrical energy.

It contains magnet and the coil which rotates and thus generates the electric current. It is based on the phenomenon of electro magnetic induction.

So, they entirely different devices and both require magnetism.

electric field is a function of 1/r^2

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

3. dark matter

empty space could also be a simple vacuum