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The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 xx 10^(3) "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: |
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Answer» Solution :`H=nl` `therefore H= (NI)/(l)""[because n= (N)/( l)]` `therefore I= (HL)/( N)` `=3 xx 10^(3)xx (0.1) /( 100)` `therefore I=3A` |
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