Solenoids: Consider a solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire. If the length of the solenoid became twice as long (2L), and all other quantities remained the same, the magnetic field inside the solenoid would

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The magnetic field inside a solenoid is given by B = μ₀(N/L)I. If the length L is doubled and N remains the same, the magnetic field becomes B = μ₀(N/2L)I, which is half as strong.

Solenoids: Consider a Solenoid of Length L, N Windings, and Radius