9) Characteristics of four different permanent magnet materials are shown in the

Question

9) Characteristics of four different permanent magnet materials are shown in the below figure Everything else being similar, what magnet material can better resist against demagnetization? a) Alnico S 15 b) Ceramic 7 c) Samarium cobalt Neodymium iron boron 06 d) Neodymium-iron-boron 0.4 0.a 0. Samarium cobalt Ceramic 7 000 900 -800-700 600 -500 -400 00 200 -100u H, kA/m 10) For the characteristics of the previous question, what magnet material could create the largest magnetic field? a) Alnico 5 b) Ceramic 7 c) Samarium cobalt d) Neodymium-iron-boron 11) In a DC machine, the current t polarity of the conductor that undergoes commutation reverses rapidly, resulting in large di/dt. This phenomenon is called a) Shift of neutral plane b) Flux weakening c) Inductive kick d) Run-out

Explanation / Answer

9- d is correct.

Resisting against demagnetization means harder to demagnetization .

So this depends on the corrosive force. Coersive force on the given graph is the number where the curves touch the horizontal axis. This may also be said to be negative value of H.

So for neodymium iron boron the coersive force is the largest.which means that this can better resist demagnetization against other given materials.

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