reluctance

/rɪˈlʌktəns/
noun
  1. Unwillingness or hesitation to do something.
    • The cat's reluctance to enter the carrier made the trip difficult.
    • Her reluctance to speak in public was obvious.
    • He showed reluctance to join the team because of the long hours.
  2. A measure of opposition to magnetic flux in a material (physics).
    • Air gaps increase the reluctance of a magnetic path.
    • Iron has low reluctance, making it a good magnetic core.
    • The engineer calculated the reluctance of the circuit.
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