PAGE EDITORS: Alec Rodriguez, Jade Azari, Philip Straus

Natland Note: (8/18/13) This is where I will post comments about suggested and necessary improvements to your page as you complete it while we are going over the content for your topic. Keep an eye on this note, as I will post new ones from time to time.

magnet 2.JPG
magnet 3.JPG
magnet 4.JPG

magnet 5.JPG
magnet 6.JPG

magnet 7.JPG
magnet 8.JPG

magnet 9.JPG
magnet 10.JPG
magnet 11.JPG


rhr 1.jpeg
Right Hand Rule-Index finger (A) represents velocity, middle finger represents (B) magnetic field, thumb (C) represents magnetic force

Second Variation of the RHR
Second Variation of the RHR

Third Variation of the RHR

Screen Shot 2014-05-11 at 5.37.23 PM.png
Some other ways you could do the RHR... but you probably shouldn't try these on the AP.

external image igcse-physics-notes-magnets-and-magnetism-html-2998850c.gif

magnet 1.jpg
The same concept as above demonstrated with iron filings

magnet 2.jpeg
The same concept as above demonstrated with iron filings

Images of Induction Loops
external image 220px-Inductance_detectors.jpgexternal image FNMM85WF6S98E5S.MEDIUM.jpg

external image fig15-1.jpg
external image A_510%20induction%20loop.png

How do induction loops work?

An induction loop system transmits an audio signal directly into a hearing aid via a magnetic field, greatly reducing background noise, competing sounds, reverberation and other acoustic distortions that reduce clarity of sound.
This diagram illustrates how they work.
hearing loop diagram
hearing loop diagram

Audio Inputs 1, either from an existing audio source such as a P.A. system or from dedicated microphone inputs feed an audio signal into an Induction Loop Amplifier 2. The amplifier drives a current into a Loop 3 or series of loops. As the current flows through the cable it creates a Magnetic Field 4 in the required area – careful loop and amplifier design ensures that the vertical component of the field is even and free of dropouts and dead zones wherever the user might be. Inside most Hearing Aids 5, a small coil known as a Telecoil 6 picks up the magnetic field signal, which is amplified into a high quality audio signal delivered directly to the ear of the hearing aid user.

Resonance Induction Loops
external image wireless-power-7.jpg
How Wireless Power Works (

external image 2787581_orig.jpg?218

external image witricity.jpg

wireless charging
wireless charging

Note the special case.

external image 1789px-Inductive_charging.svg.png
mediatek coil
mediatek coil

mass spectrometer.png
A mass spectrometer ionizes particles and shoots them into a magnetic field. The radius of curvature can be used to determine the masses of the atoms or molecules comprising a sample of material.

faraday's constant.png

1. In the operating room, anesthesiologists use mass spectrometers to monitor the respiratory gases of patients undergoing surgery. One gas that is often monitored is the anesthetic isoflurane (molecular mass = 3.06 x 10-25 kg). In a spectrometer, a single ionized molecule of isoflurane (charge = + e) moves at a speed of 6.87 x 103 m/s on a circular path that has a radius of 0.239 m. What is the magnitude of the magnetic field that the spectrometer uses?
qvBsinƟ = mv2/r
B = mv/qr

2. A square coil of wire containing a single turn is placed in a uniform 0.23-T magnetic field, as the drawing shows. Each side has a length of 0.31 m, and the current in the coil is 10 A. Determine the magnitude of the magnetic force on (a) the top and (b) left sides.
sample problem.png
F = BILsinƟ

3. In a lightning bolt, 18 C of charge flows in a time of 8.6 x 10-3 s. Assuming that the lightning bolt can be represented as a long, straight line of current, what is the magnitude of the magnetic field at a distance of 37 m from the bolt?
I = charge/seconds
B = μI/(2πr)

4. A copper rod of length 1.0 m is lying on a frictionless table (see the drawing). Each end of the rod is attached to a fixed wire by an unstretched spring whose spring constant is k = 93 N/m. A magnetic field with a strength of 0.16 T is oriented perpendicular to the surface of the table. If the current is 17 A, by how much does each spring stretch?
Fy = may
BLIsinƟ = kx
x = BLI/k


This is a branch diagram of pretty much anything in electricity and magnetism you could think of. Just click on a bubble and it'll take you to that page!

Cool experiments you can do with magnets!