Question

The corecivity of a small magnet where the ferromagnet gets demagnetized is 3×103Am1. The current required to be passed in a solenoid of length 10cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid is:

A
3A
B
6A
C
30mA
D
60mA
Solution
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μoH=μoni
n=NL=1000.1
3×103=1000.1i
i=3A

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