{"product_id":"building-a-magnet-with-electricity","title":"Building a Magnet with Electricity","description":"\u003ch3 data-start=\"835\" data-end=\"891\"\u003e\u003cstrong\u003eA copper wire alone produces only a weak magnetic field.\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3 data-start=\"893\" data-end=\"935\"\u003e\u003cstrong\u003eAn iron nail alone is not a strong magnet.\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3 data-start=\"937\" data-end=\"994\"\u003e\u003cstrong\u003eBut bring them together and something remarkable happens.\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3 data-start=\"996\" data-end=\"1118\"\u003e\u003cstrong\u003eWith a battery, a coil of wire, and an iron nail, we can create a magnet powerful enough to lift metal objects.\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3 data-start=\"1120\" data-end=\"1263\"\u003e\u003cstrong\u003eThis is the principle behind electromagnets—the technology that powers cranes, relays, electric motors, speakers, and countless modern devices.\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch1 data-start=\"1270\" data-end=\"1284\"\u003eThe Question\u003c\/h1\u003e\n\u003cp data-start=\"1286\" data-end=\"1374\"\u003eIn one of the experiment we discovered that electric current creates a magnetic field.\u003c\/p\u003e\n\u003cp data-start=\"1376\" data-end=\"1410\"\u003eBut that field is relatively weak.\u003c\/p\u003e\n\u003cp data-start=\"1412\" data-end=\"1433\"\u003eCan we strengthen it?\u003c\/p\u003e\n\u003cp data-start=\"1435\" data-end=\"1536\"\u003eCan electricity be used to create a magnet stronger than the magnetic field produced by a wire alone?\u003c\/p\u003e\n\u003ch1 data-start=\"1543\" data-end=\"1572\"\u003eChoosing the Right Material\u003c\/h1\u003e\n\u003cp data-start=\"1574\" data-end=\"1627\"\u003eNot all materials respond equally to magnetic fields.\u003c\/p\u003e\n\u003cp data-start=\"1629\" data-end=\"1673\"\u003eTo investigate, several objects were tested:\u003c\/p\u003e\n\u003cul data-start=\"1675\" data-end=\"1713\"\u003e\n\u003cli data-start=\"1675\" data-end=\"1688\"\u003ePaper clips\u003c\/li\u003e\n\u003cli data-start=\"1689\" data-end=\"1701\"\u003eSteel wire\u003c\/li\u003e\n\u003cli data-start=\"1702\" data-end=\"1713\"\u003eIron nail\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1715\" data-end=\"1754\"\u003eEach object was brought near a compass.\u003c\/p\u003e\n\u003cp data-start=\"1756\" data-end=\"1776\"\u003eThe idea was simple:\u003c\/p\u003e\n\u003cp data-start=\"1778\" data-end=\"1870\"\u003eIf a material becomes magnetized easily, it should disturb the compass needle more strongly.\u003c\/p\u003e\n\u003cp data-start=\"1872\" data-end=\"1946\"\u003eAmong the tested materials, the iron nail produced the largest deflection.\u003c\/p\u003e\n\u003cp data-start=\"1948\" data-end=\"2024\"\u003eThis suggested that it was the best candidate for building an electromagnet.\u003c\/p\u003e\n\u003ch1 data-start=\"2031\" data-end=\"2050\"\u003eWhy an Iron Nail?\u003c\/h1\u003e\n\u003cp data-start=\"2052\" data-end=\"2105\"\u003eIron contains countless microscopic magnetic domains.\u003c\/p\u003e\n\u003cp data-start=\"2107\" data-end=\"2155\"\u003eNormally these domains point in many directions.\u003c\/p\u003e\n\u003cp data-start=\"2157\" data-end=\"2186\"\u003eTheir effects largely cancel.\u003c\/p\u003e\n\u003cp data-start=\"2188\" data-end=\"2263\"\u003eWhen exposed to a magnetic field, many domains align in the same direction.\u003c\/p\u003e\n\u003cp data-start=\"2265\" data-end=\"2293\"\u003eThe iron becomes magnetized.\u003c\/p\u003e\n\u003cp data-start=\"2295\" data-end=\"2347\"\u003eThis property makes iron an excellent magnetic core.\u003c\/p\u003e\n\u003ch1 data-start=\"2354\" data-end=\"2375\"\u003eThe Power of a Coil\u003c\/h1\u003e\n\u003cp data-start=\"2377\" data-end=\"2435\"\u003eA straight wire carrying current creates a magnetic field.\u003c\/p\u003e\n\u003cp data-start=\"2437\" data-end=\"2484\"\u003eHowever, there is a more efficient arrangement.\u003c\/p\u003e\n\u003cp data-start=\"2486\" data-end=\"2520\"\u003eThe wire can be wound into a coil.\u003c\/p\u003e\n\u003cp data-start=\"2522\" data-end=\"2560\"\u003eThis arrangement is called a solenoid.\u003c\/p\u003e\n\u003cp data-start=\"2562\" data-end=\"2645\"\u003eInside a solenoid, the magnetic fields produced by each turn reinforce one another.\u003c\/p\u003e\n\u003cp data-start=\"2647\" data-end=\"2709\"\u003eThe result is a much stronger and more uniform magnetic field.\u003c\/p\u003e\n\u003cp data-start=\"2647\" data-end=\"2709\"\u003e\u003cmeta content=\"text\/html; charset=utf-8\" http-equiv=\"content-type\"\u003eMore turns and more current generally produce a stronger magnetic field.\u003c\/p\u003e\n\u003ch1 data-start=\"2908\" data-end=\"2936\"\u003eBuilding the Electromagnet\u003c\/h1\u003e\n\u003cp data-start=\"2938\" data-end=\"2997\"\u003eThe enamelled copper wire was wrapped around the iron nail.\u003c\/p\u003e\n\u003cp data-start=\"2999\" data-end=\"3051\"\u003eThe nail was then placed near a pile of paper clips.\u003c\/p\u003e\n\u003cp data-start=\"3053\" data-end=\"3080\"\u003eAt first, nothing happened.\u003c\/p\u003e\n\u003cp data-start=\"3082\" data-end=\"3130\"\u003eThe nail behaved like an ordinary piece of iron.\u003c\/p\u003e\n\u003cp data-start=\"3132\" data-end=\"3163\"\u003eThen the battery was connected.\u003c\/p\u003e\n\u003cp data-start=\"3165\" data-end=\"3204\"\u003eCurrent began flowing through the coil.\u003c\/p\u003e\n\u003cp data-start=\"3206\" data-end=\"3258\"\u003eImmediately, the paper clips jumped toward the nail.\u003c\/p\u003e\n\u003cp data-start=\"3260\" data-end=\"3289\"\u003eThe nail had become a magnet.\u003c\/p\u003e\n\u003ch1 data-start=\"3296\" data-end=\"3312\"\u003eWhat Happened?\u003c\/h1\u003e\n\u003cp data-start=\"3314\" data-end=\"3376\"\u003eThe current flowing through the coil created a magnetic field.\u003c\/p\u003e\n\u003cp data-start=\"3378\" data-end=\"3414\"\u003eThat field magnetized the iron nail.\u003c\/p\u003e\n\u003cp data-start=\"3416\" data-end=\"3503\"\u003eThe iron core then produced its own magnetic field, aligned with the field of the coil.\u003c\/p\u003e\n\u003cp data-start=\"3505\" data-end=\"3594\"\u003eTogether they generated a much stronger magnetic field than the wire alone could produce.\u003c\/p\u003e\n\u003cp data-start=\"3596\" data-end=\"3671\"\u003eYou can think of the iron as amplifying the magnetic effect of the current.\u003c\/p\u003e\n\u003ch1 data-start=\"3678\" data-end=\"3693\"\u003eA Deeper View\u003c\/h1\u003e\n\u003cp data-start=\"3695\" data-end=\"3748\"\u003eThe iron nail does not create magnetism from nothing.\u003c\/p\u003e\n\u003cp data-start=\"3750\" data-end=\"3844\"\u003eInstead, the magnetic field of the coil causes many magnetic domains inside the iron to align.\u003c\/p\u003e\n\u003cp data-start=\"3846\" data-end=\"3921\"\u003eThe aligned domains reinforce one another and strengthen the overall field.\u003c\/p\u003e\n\u003cp data-start=\"3923\" data-end=\"4014\"\u003eThis is why the electromagnet can attract objects much more effectively than the bare wire.\u003c\/p\u003e\n\u003ch1 data-start=\"4021\" data-end=\"4053\"\u003eWhy Electromagnets Are Special\u003c\/h1\u003e\n\u003cp data-start=\"4055\" data-end=\"4114\"\u003eUnlike permanent magnets, electromagnets can be controlled.\u003c\/p\u003e\n\u003cp data-start=\"4116\" data-end=\"4136\"\u003eTurn the current on:\u003c\/p\u003e\n\u003cul data-start=\"4138\" data-end=\"4159\"\u003e\n\u003cli data-start=\"4138\" data-end=\"4159\"\u003eThe magnet appears.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4161\" data-end=\"4182\"\u003eTurn the current off:\u003c\/p\u003e\n\u003cul data-start=\"4184\" data-end=\"4219\"\u003e\n\u003cli data-start=\"4184\" data-end=\"4219\"\u003eThe magnet weakens or disappears.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4221\" data-end=\"4311\"\u003eThis ability to switch magnetism on demand is one of the most useful ideas in engineering.\u003c\/p\u003e\n\u003ch1 data-start=\"4318\" data-end=\"4342\"\u003eReal-World Connections\u003c\/h1\u003e\n\u003cp data-start=\"4344\" data-end=\"4374\"\u003eElectromagnets are everywhere.\u003c\/p\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"4376\" data-end=\"4742\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"4376\" data-end=\"4415\"\u003e\n\u003ctr data-start=\"4376\" data-end=\"4415\"\u003e\n\u003cth data-start=\"4376\" data-end=\"4390\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eApplication\u003c\/th\u003e\n\u003cth data-start=\"4390\" data-end=\"4415\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eRole of Electromagnet\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"4455\" data-end=\"4742\"\u003e\n\u003ctr data-start=\"4455\" data-end=\"4503\"\u003e\n\u003ctd data-start=\"4455\" data-end=\"4475\" data-col-size=\"sm\"\u003eScrap-yard cranes\u003c\/td\u003e\n\u003ctd data-start=\"4475\" data-end=\"4503\" data-col-size=\"sm\"\u003eLift heavy steel objects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4504\" data-end=\"4551\"\u003e\n\u003ctd data-start=\"4504\" data-end=\"4522\" data-col-size=\"sm\"\u003eElectric motors\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"4522\" data-end=\"4551\"\u003eProduce rotational motion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4552\" data-end=\"4591\"\u003e\n\u003ctd data-start=\"4552\" data-end=\"4561\" data-col-size=\"sm\"\u003eRelays\u003c\/td\u003e\n\u003ctd data-start=\"4561\" data-end=\"4591\" data-col-size=\"sm\"\u003eSwitch electrical circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4592\" data-end=\"4637\"\u003e\n\u003ctd data-start=\"4592\" data-end=\"4603\" data-col-size=\"sm\"\u003eSpeakers\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"4603\" data-end=\"4637\"\u003eConvert electricity into sound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4638\" data-end=\"4688\"\u003e\n\u003ctd data-start=\"4638\" data-end=\"4653\" data-col-size=\"sm\"\u003eMRI machines\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"4653\" data-end=\"4688\"\u003eGenerate strong magnetic fields\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4689\" data-end=\"4742\"\u003e\n\u003ctd data-start=\"4689\" data-end=\"4713\" data-col-size=\"sm\"\u003eParticle accelerators\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"4713\" data-end=\"4742\"\u003eControl charged particles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-start=\"4744\" data-end=\"4853\"\u003eA simple nail and coil demonstrate the same principle used in some of the world's most advanced technologies.\u003c\/p\u003e\n\u003ch1 data-start=\"4860\" data-end=\"4890\"\u003eWhat This Experiment Teaches\u003c\/h1\u003e\n\u003cul data-start=\"4892\" data-end=\"5039\"\u003e\n\u003cli data-start=\"4892\" data-end=\"4912\"\u003eMagnetic induction\u003c\/li\u003e\n\u003cli data-start=\"4913\" data-end=\"4933\"\u003eMagnetic materials\u003c\/li\u003e\n\u003cli data-start=\"4934\" data-end=\"4945\"\u003eSolenoids\u003c\/li\u003e\n\u003cli data-start=\"4946\" data-end=\"4964\"\u003eElectromagnetism\u003c\/li\u003e\n\u003cli data-start=\"4965\" data-end=\"4983\"\u003eMagnetic domains\u003c\/li\u003e\n\u003cli data-start=\"4984\" data-end=\"5004\"\u003eEngineering design\u003c\/li\u003e\n\u003cli data-start=\"5005\" data-end=\"5039\"\u003eAmplification of magnetic fields\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"5041\" data-end=\"5073\"\u003eMost importantly, it shows that:\u003c\/p\u003e\n\u003cblockquote data-start=\"5075\" data-end=\"5154\"\u003e\n\u003cp data-start=\"5077\" data-end=\"5154\"\u003eElectricity can be used not only to create magnetism, but also to control it.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003cp data-start=\"5077\" data-end=\"5154\"\u003e \u003c\/p\u003e","brand":"Geometers","offers":[{"title":"Default Title","offer_id":45959883030664,"sku":null,"price":0.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/3891\/4952\/files\/1_d3fca0db-627e-49e0-b302-3be53dac8f46.jpg?v=1780556936","url":"https:\/\/geometers.in\/products\/building-a-magnet-with-electricity","provider":"Geometers","version":"1.0","type":"link"}