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Hysteresis

A bar magnet ...

Question

A bar magnet is demagnetized by inserting it inside a solenoid of length $0.2 m, 100 t u r a s$ , and carrying a current of $5.2 A$ . The coercivity of the bar magnet is:

1200 A / m

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2600 A / m

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5200 A / j m

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285 A / m

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Solution

The correct option is B $2600 A / m$
Coercivity $= H = \frac{B}{μ_{0}}$
$n i = \frac{N}{ℓ} i = \frac{100}{0.2} \times 5.2$
$= 2600 A / m$

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