Using A Magnet As An Electrical Current Detector

An Electric Current Produces A Magnetic Field. You Can Take Advantage Of The Fact To Generate A Simple Apparatus To Check The Electrical Conductivity Of Different Materials, Including Both Solids And Fluids. The Detector Is Composed Of A Coil Of Cable, Using A Magnetic Compass Within It. You Connect One End Of The Coil Into A D-Cell Battery. The Opposite End Of The Coil Is Attached To Whatever Material You’re Testing, And The Substance, Then, Is Attached To The Opposite End Of This D-Cell. To Put It Differently, The Coil Is Connected In Series With Whatever Material You’re Testing. To Create The Coil, Use About 10 M (33 Ft ) Of Insulated, 24 Gauge Cable. It Is Possible To Use A Roll Of Duct Tape (Or Something Similar) As The Shape For Wrap The Coil. Leave 30 Cm (About A Foot) Of Cable Loose At Each End Of The Coil For Linking It Up To Your Own Circuit. Stand The Coil Onto Its Side (You Can Prop It Up With Clay To Keep It From Rolling). Fold A Sheet Of Cardboard To Produce A Platform For The Magnetic Compass In The Middle Of The Coil. To Examine Conductivity Of A Liquid, Then Use Paper Clips Recorded On Either Side Of A Plastic Cup As Connectors. When Testing Different Substances, Join The Battery Just Long Enough To Observe The Compass Needle Motion, So The Battery Will Last Longer. Other Ideas You May Research: Learn About The”Right Hand Rule” For Magnetic Fields Created By Electrical Current. Does The Compass Needle Move As Expected Based On The Perfect Hand Rule? Learn About Ohm’s Law And Try Your Sensor In Circuits With Assorted Resistors. Is There A Connection Between How Much The Compass Needle Moves And The Current Flow In The Circuit? (Math, 1981, 13; Gardner, 2004, 80-85) Using A Magnet As An Electrical Current Detector

Using A Magnet As An Electrical Current Detector

You Can Take Advantage Of The Fact To Generate A Simple Apparatus To Check The Electrical Conductivity Of Different Materials, Including Both Solids And Fluids. The Detector Is Composed Of A Coil Of Cable, Using A Magnetic Compass Within It. You Connect One End Of The Coil Into A D-Cell Battery. The Opposite End Of The Coil Is Attached To Whatever Material You’re Testing, And The Substance, Then, Is Attached To The Opposite End Of This D-Cell. To Put It Differently, The Coil Is Connected In Series With Whatever Material You’re Testing. To Create The Coil, Use About 10 M (33 Ft ) Of Insulated, 24 Gauge Cable. It Is Possible To Use A Roll Of Duct Tape (Or Something Similar) As The Shape For Wrap The Coil. Leave 30 Cm (About A Foot) Of Cable Loose At Each End Of The Coil For Linking It Up To Your Own Circuit. Stand The Coil Onto Its Side (You Can Prop It Up With Clay To Keep It From Rolling). Fold A Sheet Of Cardboard To Produce A Platform For The Magnetic Compass In The Middle Of The Coil. To Examine Conductivity Of A Liquid, Then Use Paper Clips Recorded On Either Side Of A Plastic Cup As Connectors. When Testing Different Substances, Join The Battery Just Long Enough To Observe The Compass Needle Motion, So The Battery Will Last Longer. Other Ideas You May Research: Learn About The”Right Hand Rule” For Magnetic Fields Created By Electrical Current. Does The Compass Needle Move As Expected Based On The Perfect Hand Rule? Learn About Ohm’s Law And Try Your Sensor In Circuits With Assorted Resistors. Is There A Connection Between How Much The Compass Needle Moves And The Current Flow In The Circuit? Using A Magnet As An Electrical Current Detector

Summary Of Key Concepts – Every Magnet Has A North Pole And A South Pole. A North And A South Pole Draw Each Other, Whereas Similar Rods (North-North Or South-South) Push Each Other Away. Magnets Are Surrounded By A Magnetic Field, Which Produces A Push Or A Pull On Other Magnets Or Magnetic Substances In The Area. Magnets (Especially Neodymium Or Rare Earth Magnets) Can Be Dangerous; Always Read The Safety Precautions Before You Handle Them. These Pages Explain The Science Behind How Magnets Work. Before You Continue Reading, See Our Short Video About Magnetism:A Brief Introductory Video To Magnets And Electromagnets. Keep On Reading For More Details. When Playing With Magnets, You Likely Noticed That A Magnet Can Be Used To Attract Certain Materials Or Items, But Not Others. Figure 9, Below, Shows A Magnet Picking Up Metal Screws And Paper Clips, But Having No Impact On Timber, Rubber, Styrofoam®, Or Newspaper. A Magnet Can Be Used To Pick Up Many Metal Objects, Such As Screws Or Paper Clips (Left), But Has No Effect On Some Materials, Including Plastic, Rubber, Timber, Or Even Certain Metals (Right). If You Have Ever Played With Two Or More Magnets Simultaneously, You Probably Noticed That Magnets May Either Attract Or Repel Each Other, Depending On How They Are Positioned. This Is Because Every Magnet Has A North Pole Plus A South Pole. Opposite Poles Attract Each Other (South And North ) And Similar Poles Repel Each Other (North-North Or South-South). Every Magnet Has A North Pole And A South Pole. Opposite Poles Pull Toward Each Other, And Comparable Sticks Push Away From Each Other. If You Watched The Video Above, You Might Have Noticed That Magnetic Poles Can Push And Pull On Each Other Without Touching Each Other. Magnets Can Do So Because They’re Surrounded By A Magnetic Field. It’s The Magnetic Field That Creates The Force (A Push Or A Pull) On Other Magnets Or Magnetic Substances In The Area. The Magnetic Field Gets Weaker As You Get Farther And Farther Away From A Magnet; Therefore Magnets Can Be Quite Powerful Up Close, But They Do Not Have Much Of An Effect On Objects (Like Other Magnets) Which Are Very Far Away.Magnetic Fields Are Invisible; You Can’t See Them With Your Eyes. So, How Do We Know They’re There, Or What They Look Like? Scientists Signify The Invisible Magnetic Field By Drawing Magnetic Field Lines. These Are Lines That Stage From The North Pole To The South Pole Outside The Magnet (Inside The Magnet They Point From The South Pole To The North Pole). The Magnetic Field Is Strongest (Or The Magnet Has The Strongest Pull Or Push Other Magnetic Material) Where These Lines Are Bunched Closely Together, And Weakest Where They Are Spaced Farther Apart. A Frequent Method To Visualize Magnetic Field Lines Would Be To Sprinkle Many Miniature Iron Filings Near A Magnet. On The Left, Magnetic Field Lines Point From The North Pole Of A Magnet To The South Pole Away From The Magnet (Image Credit Wikimedia Commons User Geek3, 2010). On The Right, You Can See These Lines Using Iron Filings. You Can Even Detect A Magnetic Field By Using A Compass. A Compass–Such As The One Displayed In Figure 12–Is Actually A Small Bar Magnet That Is Free To Rotate On A Pivot. A Compass Is A Device With A Rotating Magnetic Needle Which Can Be Used To Navigate. Using A Magnet As An Electrical Current Detector The N, S, E And W On The Compass Stand For North, South, East, And West, Respectively. In This Image, The N And S Are Partially Hidden Behind The Needle. Normally, A Compass Will Align With Earth’s Magnetic Field, So Its Needle Will Align Itself About With The Geographic North-South Direction (Not Perfectly, Though; There Is Truly A Slight Offset Between Earth’s Magnetic And Geographic Poles). It Follows That A Compass Can Be Used To Navigate So You Can Determine Which Directions Are North, South, East, And West. However, If You Bring A Compass Quite Close To Another Magnet, That Magnet Will Have A Stronger Effect On The Needle Compared To Earth’s Magnetic Field. The Compass Needle Will Align With The Local (Or”Nearby”) Magnetic Field (The Traces Shown In Figure 11).Earth Actually Acts Like It’s A Large”Upside-Down” Bar Magnet Inside Of It. The South Pole Of The Bar Magnet Is Actually Close (But Not Perfectly Lined Up With) Earth’s North Pole, And Vice Versa. This May Be Confusing; Simply Look At Figure 13 In The Event You Will Need To Remember Which End Of The Compass Needle Is That!Using A Magnet As An Electrical Current Detector. You Can Imagine Earth’s Magnetic Field Like There Is A Giant Bar Magnet Buried Inside Earth. The Magnet’s South Pole Is Close To Earth’s Geographical North Pole, And The Magnet’s North Pole Is Close To Earth’s Geographic South Pole. Earth’s Magnetic And Geographic Poles Do Not Line Up With Each Other Perfectly, But They Are Very Close. There Are Numerous Distinct Types Of Magnets. Permanent Magnets Are Magnets Which Permanently Retain Their Magnetic Field. This Is Different From A Temporary Magnet, Which Usually Only Has A Magnetic Field When It’s Placed In A Bigger, Stronger Magnetic Field, Or If Electrical Current Flows Through It. The Bar Magnet And Paper Clips From Figure 9 Are Examples Of Permanent And Temporary Magnets, Respectively. The Bar Magnet Is Surrounded By A Magnetic Field, So It’s A Permanent Magnet. The Paper Clips Do Not Normally Have A Magnetic Field; Quite Simply, You Can’t Use One Paper Clip To Pick Up Another Paper Clip. But When You Bring The Bar Magnet Near The Paper Clips, They Become Magnetized And Act Like Magnets, So They Are Temporary Magnets. Another Sort Of Temporary Magnet, Called An Electromagnet, Uses Power To Create A Magnet. Watch The Electromagnetism Tab To Learn More About Electromagnets.In Everyday Language, We Usually Just Refer To Magnets, And Materials That Are Attracted To Magnets, As”Magnetic.” Technically, These Materials Are Known As Ferromagnetic. It’s Important To Remember That Not All Metals Are Ferromagnetic. You Will See This If You Try To Get A Copper Penny Or A Sheet Of Aluminum Foil Using A Magnet. The Most Common Ferromagnetic Metals Are Iron, Nickel, And Cobalt.Ferromagnetic Material Contains Many Tiny Magnetic Domains At The Microscopic Level. Normally, These Domains Point Randomly In All Different Directions, So All The Tiny Magnetic Fields Cancel Each Other Out, And The Overall Material Is Not Surrounded By A Magnetic Field. However, When A Material Is Magnetized (Usually By Putting It In A Strong Magnetic Field), Each One These Little Magnetic Fields Line Up, Creating An Overall Larger Magnetic Field.Figure 14. In Ferromagnetic Material, Miniature Magnetic Fields Can Be Oriented Randomly In Different Directions, Canceling Each Other Out. In Cases Like This, The Material Will Not Show Magnetic Features (Left). When The Magnetic Fields Lineup And All Point In The Same Way, They Combine And Generate A Large Magnetic Field. The Material Will Then Demonstrate The Characteristic Of A Magnet (Right). How, Exactly, The Little Magnetic Fields Are Generated Depends On How Electrons Move Inside Atoms. To Find Out More About Electricity And Electrons, See The Static Electricity Tab.

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