Question

Which of the following could you do to increase the strength of an electromagnet? decrease the number of windings
decrease the electric current
change the core from wood to iron
all of the above

Answer 1

To INcrease the strength of an electromagnet ...

... INcrease the number of windings
... INcrease the electric current (by increasing the voltage of the battery)
... change the core from wood to iron

Answer 2

change the core from wood to iron