What is an advantage of using a ferrite core toroidal inductor?
Large values of inductance may be obtained
The magnetic properties of the core may be optimized for a specific range of frequencies
Most of the magnetic field is contained in the core
All these choices are correct✓Correct answer
Explanation
A ferrite toroid gives all three benefits at once: the high permeability of ferrite yields large inductance from few turns, the mix can be chosen for a given frequency range, and the closed ring keeps nearly all the flux inside the core so the coil neither radiates nor picks up stray coupling.