Question.5058 - By now, you have already become an expert in magnetic fields!Tesla is a unit for magnetic fields. Yes, the same Tesla that Elon Musk named his electric cars after. But one Tesla is a very strong magnetic field. As you will find out later, the Earth's magnetic field is so weak that it is not convenient to use Tesla as the unit. Instead, we tend to use micro-Tesla (or μT) and 1μT=10−6T.Unlike electric fields that can be generated by electric charges, magnetic fields can only be generated by moving electric charges or time-varying electric fields. There are no magnetic charges (magnetic monopole would be the name). Earth's magnetic field is generated by electric currents inside the Earth.In this second and final mini-project, you will use a magnetometer to measure the Earth's magnetic field. It's highly recommended to use a smartphone app such as Physics Toolbox—see the Module 1 Heads Up! page for more information. Assignment InstructionsIn a brief lab report in the format of your choosing, address the following: Find a place that is far enough away from any known culprits and measure the magnetic field. Culprits mean anything that can generate magnetic fields, such as a bar magnet (duh), a fridge, a cordless smartphone charger, etc. The point is that you want to minimize all other contributing factors to measure the magnetic field due to Earth.Calculate the energy density of the magnetic field you measured with the formula u=12B2μ0, where μ0=4Ï€—10−7NA2 is the magnetic permeability of free space.Place the magnetometer (likely your phone) near a wire with electric currents, such as a lamp, and repeat the magnetic field measurements and the energy density calculations in previous steps. Document your findings, including a screenshot from your magnetometer. Place the magnetometer near a bar magnet or a magnetic charger. Repeat the magnetic field measurements and the energy density calculations in previous steps. Document your findings, including a screenshot from your sound meter. Pick the strongest magnetic field you measured and its energy density. Suppose you could convert all the energy stored in the magnetic field in a space that is a cubic foot to heat up water; how much near-freezing water can you boil?Thinking back about what you did in the Module 4 Sound Intensity Mini-Project, what conclusions can you reach? Specifically, what can you say about the "invisible" things (sound waves and magnetic fields) that you don't normally associate with energy in the macroscopic sense? What is the most fundamental difference between sound waves and electromagnetic waves?
Answer Below:
Mini-Project xxxxxxx Magnetic xxxxxx Measurement xx Earth x Magnetic xxxxx To xxxxxxx Earth x magnetic xxxxx BEarth xxxxxxxxxxxx are xxxxx utilizing x higher xxxxxxxxxxx axis xxxxxxxxxxxx smartphone xxxxx in x magnetically xxxxx zone xxxx a xxxxxx park x from xxx urban xxxxxxxxxxxxxx with xxxxxxxxxx where xx visible xxxxxxxx or xxxxxxxxxx artifacts xxxxxx phone xx airplane xxxx resulting xxxxxx T xxxxxx the xxxxxxxxxxx that xx predominantly xxxxxxxx component xxxxxxxxx consistent xxxx Northern xxxxxxxxxx geomagnetic xxxxxxxxxxx Q xxxxxx Density xx Earth x Magnetic xxxxxxxx magnetic xxxxxx density x in x vacuum xx given xx u x where x - x - x A x - x - x m x Magnetic xxxxx Energy xxxxxxx with xxxxxxxx SourcesNear xx electric xxxx cord xxxxxxxx magnetic xxxxx Blamp x lamp x - x J x Near xxx magnet xxxxxxxx magnetic xxxxx Blamp x lamp x - x J x Near xxxxxxxx inductive xxxxxxx Measured xxxxxxxx field xxxxxxxx TUcharger x - x J x Q xxxxxxxxxx of xxxxxxxx Energy xxxx Heat xx a xxxxx FootTaking xxx maximum xxxxx from xxx wireless xxxxxxxx TU x J x volume xxxxx foot x In xxxxx of xxxxx energy x u x - x JNow xxxxxxx on xxxxxxxx within xxxxxxxxxx where xxxx water xxxx oC xx OC xxxxxxxxx Q xx T xxxx c x KgoC x oC xxxxxxx for xxxx M x c x - x kg xxxxxxxxxx of xxxxx a xxxxxxxx of x droplet xxxxxxx the xxxxxx local xxxxx the xxxxxx density xx still xxxxxxxxx Q xxxxxxxxxx Magnetic xxxxx vs xxxxx WavesIn xxxxx of xxxxxxxxxxxxx both xxx invisible xxx measurable xxxxxxxxxxxxxx of xxxxxx both xxxxxxxx with xxxxxx can xx quantified xx terms xx energy xxxxxxxx per xxxx volume xxxxx both xxxxxxx wave xxxx properties xxx fundamentally xxxxxx in xxxxx nature xxxxxxx differences xxxxxxx PropertySound xxxxxxxxxxxxxxxxxxxx Magnetic xxxxxx NatureMechanical xxxxxxxxxxxx pressure xxxx Electromagnetic xxxxxx field xxxxxxxxxxxx Medium xxxxxxxxxxx e x air xxxxx solids xx propagate xx vacuum xxxxx m x in xxx m x in xxxxxxxxxxxx Transfer xxxxxxxxxxxxxxxxx vibrationOscillating x and x fieldsGoverning xxxxxxxxxxxxxxxxxx mechanics xxxxxxxx wave xx Maxwell x EquationsBased xx my xxxxxxxxxxxxx the xxxxxx stored xx sound xxxxxx under xxxxx conditions xxx both xxx orders xx magnitude xxxxx what xx needed xxx practical xxxxxxxxxxx transformations xxxx boiling xxxxx these xxxxxxxxx fields xxxx become xxxxxxxxxxxxxxx powerful xxxx manipulated xx scale xxx example xxxxxxxxx heating xxx machine xx jet xxxxxxx for xxxxxxxx energyMore Articles From PHYS 250 Physics III for Engineers
.ico)
.ico)
.ico)
