Question

A solenoid has a total of \(N\) turns wound uniformly over a length \(l\). What is the expression for the number of turns per unit length?

Options

• \(n = \frac{N}{l}\)

• \(n = \frac{l}{N}\)

• \(n = \frac{N}{2\pi l}\)

• \(n = N \cdot l\)

Answer 1

The turns per unit length of a solenoid is defined as \(n = \frac{N}{l}\), where \(N\) is the total number of turns and \(l\) is the length of the solenoid. This quantity directly determines the strength of the magnetic field via \(B = \mu_0 n I\).