Question

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

Explanation:

Step1: Recall electromagnet strength factors

The strength of an electromagnet depends on current, number of loops and presence of a ferromagnetic core.

Step2: Analyze each option

Adding batteries increases voltage and thus current, increasing strength. Increasing wire - loops increases strength. Increasing current increases strength. Removing the iron core (a ferromagnetic material that enhances the magnetic field) decreases the strength.

Answer:

removing its iron core