In the hysteresis cycle, the value of H needed to make the intensity of magnetization zero is called
Correct answer: B. Coercive force
- A. Retentivity
- B. Coercive force
- C. Lorentz force
- D. None of the above
Explanation
The correct answer is Coercive force. In the hysteresis cycle, the coercive force is the measure of the resistance of a ferromagnetic material to becoming demagnetised. It is the value of the applied magnetic field strength (H) required to bring the intensity of magnetisation to zero after the material has been magnetised to saturation. Retentivity, on the other hand, refers to the remaining magnetisation in the material when the external field is removed. The Lorentz force is unrelated to the hysteresis cycle, as it deals with the force on charged particles in magnetic and electric fields.
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