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Q.

The coercivity of a small magnet where the ferromagnet gets demagnetized is 3×103Am−1. The current (in ampere) 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 ____.

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answer is 3.

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Detailed Solution

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B=μonI  :H=Bμo=NIL

3×103=100×I0.10

⇒I=3A

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