Question

an electromagnet is made up of a coil of electrical wire wrapped around an iron core. 4 which of the following is a way to increase the strength of an electromagnet? a. increase the temperature of the iron core. b. increase the temperature of the air around it. c. increase the amount of electricity running through the coil. d. replace the iron core with a plastic core. reset submit

Explanation:

• For option A: Increasing the temperature of the iron core generally decreases the magnetic properties of the iron (due to reduced alignment of magnetic domains), so it does not increase the electromagnet's strength.
• For option B: The temperature of the surrounding air has no direct effect on the magnetic field produced by the electromagnet.
• For option C: The strength of an electromagnet is directly related to the current (amount of electricity) flowing through the coil. Increasing the current increases the magnetic field strength, so this is a valid way to increase the electromagnet's strength.
• For option D: Plastic is not a magnetic material, so replacing the iron core (a magnetic material) with a plastic core would significantly decrease the strength of the electromagnet, as the iron core helps concentrate and amplify the magnetic field.

Answer:

C. Increase the amount of electricity running through the coil