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Magnetic Field due to Solenoid

The coercivit...

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The coercivity of a bar magnet is 100A/m. It isto be demagnetised by placing it inside a solenoidof length 100 cm and number of turns 50. Thecurrent flowing the solenoid will be(1) 4A (2) 2A (3) 1A (4) zero

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Q. The corecivity of a bar magnet is

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