The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 103 Am–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is:

Engineering

Physics

Magnetization and Magnetic Intensity

Question

The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 10³ Am^–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is:

30 mA

3 A

60 mA

6 A

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$3 \times 10^{3} = x_{i} = \frac{100}{0 .1} \times i$

i = 3A