CHALLENGER'S LOST LESSONS - ER - NASA

48Attach a “D” battery to the circuit by pressing, or taping,one of the wires to the battery’s anode (positive terminal) and theother wire to the cathode (negative terminal.) At once, the iron nailbecomes magnetic. As with the previous experiment roll thechamber over and move it so that the electromagnets lines of forcecan be established. Finally, orient the chamber bottle vertically withthe earth.Supplemental InformationAn excellent video produced by the NASA Langley ResearchCenter deals with both making an electro-magnet and experimentingwith it. After depressing the ctrl key, click here to view the oneminute video.