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Select the most appropriate option to fill in the blank. _____ error occurs as the value of flux density is different for the same value of current when increasing and decreasing.
Hysteresis
Frequency
Friction
Temperature
Hysteresis
Hysteresis error occurs in ferromagnetic materials when the magnetic flux density (B) lags behind the magnetizing force (H). It results in different values of B for the same H depending on whether the current is increasing or decreasing, forming a closed loop known as the B-H curve.
Hysteresis error occurs in ferromagnetic materials when the magnetic flux density (B) lags behind the magnetizing force (H). It results in different values of B for the same H depending on whether the current is increasing or decreasing, forming a closed loop known as the B-H curve.
Think of it like a memory foam mattress: when you press it, it stays indented for a moment even after you remove your hand, reflecting the 'lag' in returning to its original state.
HI-LAG: Hysteresis involves the Intensity (Flux Density) LAGGING behind the applied force.
W=тИоHтЛЕdB тАФ Energy loss per unit volume per cycle
PhтАЛ=╬╖fBmax1.6тАЛ тАФ Steinmetz hysteresis loss formula
When a ferromagnetic material is subjected to an alternating magnetizing field, the domain walls experience internal friction as they rotate and align. The energy spent in overcoming this resistance is dissipated as heat, causing the magnetic state to depend on the material's previous magnetization history (remanence). This path dependency manifests as the hysteresis loop in the BтИТH graph.
Hysteresis is a property of ferromagnetic materials like iron and steel.
The area inside the B-H loop is proportional to the energy lost as heat per cycle.
Hard magnetic materials have large hysteresis loops, while soft materials have thin ones.
Used in memory storage devices (magnetic tapes/disks).
Useful for creating permanent magnets.
Causes significant power loss in transformers and electric motors.
Leads to undesirable heating in electrical machinery cores.
Core construction of power transformers.
Magnetic recording media and storage.
Frequency (Option B) refers to the number of cycles per second and is not a measurement error of this type.
Friction (Option C) is a mechanical resistance force, not a magnetic property.
Temperature (Option D) affects resistivity and magnetic properties but is not defined by flux density lag.
A is correct тАФ Hysteresis represents the dependency of the magnetic state on the previous history of the material, causing a lag in flux density.
Remember that hysteresis loss increases linearly with frequency (f), which is why high-frequency devices use soft magnetic cores like ferrites to minimize these losses.