N - 300 turns of this wire are uniformly wound on a permanent magnet shaped as a cylinder whose length is equal to l - 15 cm- 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-

Question

Toppr Admin · Accepted Answer

The coercive force Hc is just the magnetic field within the cylinder- This is by circulation theorem- Hc-NIl-6kA-m-from -x222E-x2192-H-x22C5-d-x2192-r-I- total current- considering a rectangular contour-

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

The coercive force Hc is just the magnetic field within the cylinder. This is by circulation theorem, Hc=NIl=6kA/m(from ∮→H⋅d→r=I, total current, considering a rectangular contour.)

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