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The coercivity of a small magnet where the Ferro magnet gets demagnetised is 3×103A/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 3.

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Detailed Solution

Formula : H=niH –intensity of magnetic fieldn- no. of turns per unit length n=NLi-Current ∴i=H(L)N=3×103×10-1102 ⇒i=3A

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