Question

In the formula \(B = \mu_0 n I\) for the magnetic field inside a long solenoid, what does the quantity \(n\) represent?

Options

• Radius of the solenoid

• Number of electrons flowing per second

• Total number of turns in the solenoid

• Number of turns per unit length

Answer 1

In the formula \(B = \mu_0 n I\), \(n\) represents the number of turns per unit length, calculated as \(n = \frac{N}{l}\), where \(N\) is the total number of turns and \(l\) is the length of the solenoid. It should not be confused with \(N\), the total number of turns.