Another student made an electromagnet with an iron nail with eight coils of wire wound around it connected to a 2-V battery. She wants to increase the strength of the electromagnet. What changes can she make to her design to increase its strength?
A. use a longer wire
B. wrap more coils of wire around the nail
C. use two 1-V batteries instead of a 2-V battery
D. use a 4-V battery
D because A is just gonna give the same power but slower. B is just going to give the same power but faster. C is gonna give the same power, but D is going to give more power than. The rest of the options.
