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>> $The corecivity of a small magnet where t$

Question

The corecivity of a small magnet where the ferromagnet gets demagnetized is $3 \times 1 0^{3} A m^{- 1}$ . The current required to be passed in a solenoid of length $10 c m$ and number of turns $100$ , so that the magnet gets demagnetized when inside the solenoid is:

A

$3 A$

B

$6 A$

C

$30 m A$

D

$60 m A$

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Updated on : 2022-09-05

Solution

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Correct option is A)

$μ_{o} H = μ_{o} n i$
$n = \frac{N}{L} = \frac{1 0 0}{0 . 1}$
$3 \times 1 0^{3} = \frac{1 0 0}{0 . 1} i$
$i = 3 A$

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