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>> $N = 300 turns of this wire are uniformly$

Question

$N = 300$ turns of this wire are uniformly wound on a permanent magnet shaped as a cylinder whose length is equal to $l = 15 c m$ . When a current $I = 3.0 A$ was passed through the wiring the field outside the magnet disappeared. Find the coercive force $H_{c}$ of the material from which the magnet was manufactured.

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Updated on : 2022-09-05

Solution

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Correct option is A)

The coercive force $H_{c}$ is just the magnetic field within the cylinder. This is by circulation theorem, $H_{c} = \frac{N I}{l} = 6 k A / m$

(from $\oint H \cdot d r = I$ , total current, considering a rectangular contour.)

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