Using the equation B = (μ₀NI) / L, explain why when the voltage of the battery connected to the electromagnet decreases while other quantities remain constant, the current flowing through the solenoid decreases.
A) Because the magnetic flux density B is directly proportional to the current I.
B) Because the decrease in voltage does not affect the magnetic field.
C) Because the inductance L increases as the voltage decreases.
D) Because the permeability of free space μ₀ changes with voltage.