Question

Select each correct answer. More than one answer may be correct.
The electromagnet shown below is made up of a coil of electrical wire wrapped around an iron core.



Which of the following would decrease the strength of this electromagnet?

removing its iron core
increasing the number of wire loops in the coil
adding batteries to the circuit
increasing the current through the co

Answer 1

Removing its iron core.

Reason: The iron core concentrates and greatly increases the magnetic field. Increasing loops, adding batteries (more EMF), or increasing current all increase the magnet's strength rather than decrease it.