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Out of the following materials, the area of hysteresis loop will be least forтАжтАжтАж
soft steel
silicon steel
hard steel
wrought iron
silicon steel
Quick Summary: The hysteresis loop area represents the energy dissipated as heat per unit volume during one cycle of magnetization. Silicon steel exhibits a very narrow hysteresis loop, resulting in minimal magnetic energy loss, which makes it ideal for transformer cores and electrical machines.
The hysteresis loop area represents the energy dissipated as heat per unit volume during one cycle of magnetization. Silicon steel exhibits a very narrow hysteresis loop, resulting in minimal magnetic energy loss, which makes it ideal for transformer cores and electrical machines.
WhтАЛ=╬╖Bmax1.6тАЛfV тАФ Steinmetz hysteresis loss formula where WhтАЛ is energy loss, f is frequency, and V is volume.
Area=тИоHdB тАФ The physical definition of the area under the B-H loop as energy density per cycle.
The energy loss per cycle is directly proportional to the area of the B-H curve, given by the Steinmetz hysteresis loss formula WhтАЛ=╬╖BmaxxтАЛfV. By adding silicon to steel, the material's magnetic retentivity and coercivity are reduced, thereby 'shrinking' the loop width and lowering the energy waste.
Hysteresis loss is directly proportional to the area of the B-H loop.
Hard steel is a magnetically hard material with a large hysteresis loop, making it suitable for permanent magnets.
Silicon steel is magnetically soft, providing low core loss (iron loss).
Adding silicon increases electrical resistivity, further reducing eddy current losses in addition to hysteresis losses.
Lower heat generation in transformers
Improved energy efficiency of electrical machines
Silicon steel is more brittle than mild steel
Increased manufacturing complexity
Transformer cores
Stator and rotor laminations for motors and generators
Silicon steel typically contains 1% to 4.5% silicon.
Hard steel has a very wide loop, representing high coercivity and retentivity, which is the opposite of the requirement for low-loss electrical machinery.
B is correct тАФ Silicon steel has the least hysteresis loop area among the options, minimizing energy dissipation during magnetic reversal.
Always remember that 'magnetically soft' materials have thin hysteresis loops (low loss), while 'magnetically hard' materials have wide loops (permanent magnets).