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Current in a solenoid needed to demagnetise a magnet of given coercivity

This type of question, asked 2 times: 10 Apr 2023, 8 Apr 2024. All 2 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    10 Apr 2023

    24
    The current required to be passed through a solenoid of 15 cm15\text{ }cm length and 60 turns in order to demagnetise a bar magnet of magnetic intensity 2.4×103Am−12.4 \times10^{3}Am^{- 1} is___ A.

  2. Question 2

    8 Apr 2024

    111
    The coercivity of a magnet is 5×103 A/m5 \times10^{3}\text{ }A/m. The amount of current required to be passed in a solenoid of length 30 cm30\text{ }cm and the number of turns 150, so that the magnet gets demagnetised when inside the solenoid is _____ A.