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>> $A bar magnet is demagnetized by insertin$

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:

A

$1200 A / m$

B

$2600 A / m$

C

$5200 A / j m$

D

$285 A / m$

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Updated on : 2022-09-05

Solution

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Correct option is B)

Coercivity $= H = \frac{B}{μ _{0}}$
$n i = \frac{N}{ℓ} i = \frac{1 0 0}{0 . 2} \times 5.2$
$= 2600 A / m$

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