Question

multiple choice listen which of the following will increase the strength of the magnetic field produced by an electromagnet? a reverse the flow of electricity. b add an iron core to the solenoid. c disconnect the power source. d reduce the number of coils in the solenoid.

Explanation:

Reversing the electricity flow changes the magnetic - field direction, not strength. Disconnecting the power source stops the magnetic field. Reducing the number of coils weakens the field. Adding an iron core to the solenoid of an electromagnet increases its magnetic - field strength as iron is a ferromagnetic material that can be magnetized easily.

Answer:

B. Add an iron core to the solenoid.