A solenoid has 137 turns of wire uniformly wrapped around anair-filled core, which has a diameter of 6 mm and a length of 8.5cm. The permeability of free space is 1.25664 × 10−6N/A^2 . Calculate the self-inductance of the solenoid. Answer inunits of H.
The core is replaced with a soft iron rod that has the samedimensions, but a magnetic permeability of 800 μ0. What is thenew inductance? Answer in units of H.