Question

Which of the following factors would decrease the magnetic field strength of an electromagnet?(1 point)
Responses

increasing the distances between the turns of the coil
increasing the distances between the turns of the coil

increasing the current or using a higher-voltage power source
increasing the current or using a higher-voltage power source

using an iron core or nail
using an iron core or nail

increasing the number of turns in the coil of wire
increasing the number of turns in the coil of wire

Answer 1

Increasing the distances between the turns of the coil.

Reason: B ≈ μ n I (n = turns per unit length). Spreading the turns lowers n so B decreases. Increasing current, adding an iron core, or adding turns all increase the magnetic field.