Demostrate the Force Developed by an Electrmagnet with a Single Battery. How many of your students can lift 100 times their own weight. This 6.3 cm, 0.9 Kg dissectible electromagnet can do just that - with the help of one 1.5 V D-cell battery that you provide - lifting up to 90 Kg. the core and yoke are precision - tolerated to within .03 mm. The battery is linked by alligator clips to a DC coil.