By wrapping a conductive wire around a steel nail and adding a battery, you've created what is known as a solenoid. This solenoid produces a magnetic field around the nail when a current is passed through it. There is an equation that relates the various properties of the solenoid together to determine the strength of the magnetic field; in short, to increase the strength, you can shorten the overall length of the coiled wire (not the wire itself, but the length of the coil around the nail), increase the current flowing through the wire, or increase the number of turns/loops of wire around the nail.
Hope this helps!
Answer: wrap more coils of wire around the nail
Explanation: took test :))
