Question

which of the following factors would decrease the magnetic field strength of an electromagnet? (1 point) increasing the current or using a higher-voltage power source using an iron core or nail increasing the number of turns in the coil of wire increasing the distances between the turns of the coil

Explanation:

To determine what decreases an electromagnet’s magnetic field strength, recall factors affecting it: current, core material, number of coil turns, and coil spacing. Increasing current (higher voltage) increases field strength. Using an iron core (ferromagnetic) increases it. Increasing coil turns increases it. Increasing distance between coil turns reduces the concentration of the magnetic field produced by each turn, thus decreasing overall field strength.

Answer:

D. increasing the distances between the turns of the coil