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The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times10^3\;Am^{-1}$. The current required to a passed in a solenoid of length $10\; cm$ and number of turns $100$, so that the magnet gets demagnetized when inside the solenoid, is

$\begin{array}{1 1}(A)\;3\;A \\ (B)\;6\;A \\(C)\;30\;mA \\(D)\;60\;mA \end{array} $

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the magnet gets demagnetized when inside the solenoid, is $3\;A$
Hence A is the correct answer.
answered Apr 7, 2014 by meena.p
 

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