Question Detail
Out of the following materials, the area of hysteresis loop will be least forтАжтАжтАж
Options
- Option A: soft steel
- Option B: silicon steel
- Option C: hard steel
- Option D: wrought iron
Correct Answer
silicon steel
Solution & Explanation
{"type":"technical","methodBadge":"Concept & Principle","explanation":"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.","workingPrinciple":"The energy loss per cycle is directly proportional to the area of the B-H curve, given by the Steinmetz hysteresis loss formula $W_h = \\eta B_{max}^{x} f V$. By adding silicon to steel, the material's magnetic retentivity and coercivity are reduced, thereby 'shrinking' the loop width and lowering the energy waste.","diagramSvg":"Hysteresis Loss Formula$P_h = \\eta \\cdot B_{max}^{1.6} \\cdot f \\cdot V$$Area \\propto Energy Loss$Silicon steel has the smallest area","keyFormulas":["$W_h = \\eta B_{max}^{1.6} f V$ тАФ Steinmetz hysteresis loss formula where $W_h$ is energy loss, $f$ is frequency, and $V$ is volume.","$Area = \\oint H dB$ тАФ The physical definition of the area under the B-H loop as energy density per cycle."],"keyPoints":["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."],"advantages":["Lower heat generation in transformers","Improved energy efficiency of electrical machines"],"disadvantages":["Silicon steel is more brittle than mild steel","Increased manufacturing complexity"],"applications":["Transformer cores","Stator and rotor laminations for motors and generators"],"comparisonTable":[],"additionalInfo":["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."],"answer":"B is correct тАФ Silicon steel has the least hysteresis loop area among the options, minimizing energy dissipation during magnetic reversal.","correctedOptions":["soft steel","silicon steel","hard steel","wrought iron"],"coreConcepts":["Hysteresis Loss","Magnetic Materials","B-H Loop"],"crossTopicTip":"Always remember that 'magnetically soft' materials have thin hysteresis loops (low loss), while 'magnetically hard' materials have wide loops (permanent magnets)."}
Question (Hindi)
рдирд┐рдореНрдирд▓рд┐рдЦрд┐рдд рд╕рд╛рдордЧреНрд░рд┐рдпреЛрдВ рдореЗрдВ рд╕реЗ, рд╣рд┐рд╕реНрдЯреИрд░рд┐рд╕реАрд╕ рд▓реВрдк (hysteresis loop) рдХрд╛ рдХреНрд╖реЗрддреНрд░рдлрд▓ рд╕рдмрд╕реЗ рдХрдо рдХрд┐рд╕рдХреЗ рд▓рд┐рдП рд╣реЛрдЧрд╛тАжтАжтАж