Which of the solenoids described below has the greatest magnetic field along its axis?
A)a solenoid of length L, with N turns and a current I
B)a solenoid of length L, with N/2 turns and a current I
C)a solenoid of length L/2, with N/2 turns and a current I
D)a solenoid of length 2L, with N turns and a current I/2
E)a solenoid of length 2L, with 2N turns and a current 2I

Question

Quizplus · Accepted Answer

The magnetic field inside a solenoid is given by B = μ₀ * (N/L) * I. Solenoid E has the highest number of turns per unit length (2N/2L = N/L) and the highest current (2I), resulting in the greatest magnetic field.

Which of the Solenoids Described Below Has the Greatest Magnetic