Roger builds an electromagnet by coiling some wire around an iron bolt and connecting the wire to a battery. The electromagnet is strong enough to lift paper clips. Which option describes what is happening here?
Select one:

Electrical energy is used to produce gravitational force.

Kinetic energy is used to produce gravitational force.

Electrical energy is used to produce magnetic force.

Kinetic energy is used to produce magnetic force.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".