PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which change will most likely increase the strength of a magnetic field produced by an electromagnet?
Question options:
Reduce the number of turns of the coil
Switch the direction in which the battery is connected
Remove the iron nail
Increase the voltage of a battery
