Extra exam question E6D11

WhyBrass is the type of core material that decreases inductance when inserted into a coil. Brass is a non-magnetic, electrically conductive material, and inserting it into a coil generates eddy currents that oppose and reduce the coil's inductance, the opposite effect a magnetic core material like ferrite or powdered iron would have, answer B. Ceramic, ferrite, and aluminum don't produce this same inductance-reducing effect the way brass's specific combination of conductivity and non-magnetic behavior does (aluminum shares brass's conductivity but isn't the material typically cited for this classic tuning-slug effect).