reluctivity

/rɪˌlʌkˈtɪvəti/
noun
  1. A measure of how much a material resists the flow of magnetic energy, similar to electrical resistance.
    • Materials with high reluctivity are used to block magnetic fields in sensitive electronic devices.
    • The engineer calculated the reluctivity of the iron core to design a more efficient transformer.
    • The teacher explained that reluctivity is the opposite of magnetic permeability.
Antonyms