David decides to build an electromagnet to pick up the box of tacks he dropped on the floor. He did everything just like his teacher did in class with a D-cell battery, wire and nail But since he did not have any iron nails, he used a plastic nail from his baby brother's toy workbench to wrap the wire around. Which of
the following explains what happened when David hooked up the wire to the battery.
the electromagnet worked better when he hooked up a 9 von battery to replace the battery
the electromagnet did not work because the plastic nail acted as an insulator
the electromagnet did not work because the plastic nail allowed fewer cols in the electromagnet.
the electromagnet worked perfectly picking up all the tacks David dropped.