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The coercivity of a small magnet where the Ferro magnet gets demagnetised is $3 \times 10^{3} A / m$ . The current to be passed in a solenoid of length 10cm and no. of turns 100, so that the magnet gets demagnetized when inside the solenoid is

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answer is C.

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Detailed Solution

Formula : $H = n i$

H –intensity of magnetic field

n- no. of turns per unit length

$n = \frac{N}{L}$

$i -$ Current

$∴ i = \frac{H (L)}{N} = \frac{3 \times 10^{3} \times 10^{- 1}}{10^{2}}$

$\Rightarrow i = 3 A$

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