Applications of a simple approximation of Bessel functions of integer order, in terms of trigonometric functions, are discussed for several examples from electromagnetism and optics. The method may be applied in the intermediate regime, bridging the "small values regime" and the "asymptotic" one, and covering, in this way, an area of great…

Given the importance of teachers to student learning, it is important to understand how schools of choice differ in terms of the types and uses of human capital inside schools. Despite research that highlights important differences in the qualifications and staffing practices of schools of choice, there is no evidence about whether observed…

Considers health hazards that may be associated with the electromagnetic effects produced by high voltage electric transmission lines. (GS)

Discusses the question posed by some that the earth's magnetic field may reverse. States that rocks magnetized by ancient fields may offer clues to the underlying reversal mechanism in the earth's core. (TW)

If oxygen is attracted to a magnet, is there more oxygen in the air near the north magnetic pole? Explains why the answer to this question (posed by a high school physics student) is "no." (JN)

The Illinois state superintendent of education offers his "dream" about the way Chicago integrated its schools. (IRT)

Presents a demonstration designed to illustrate Faraday's, Ampere's, and Lenz's laws and to reinforce the concepts through the analysis of a two-loop magnetic circuit. Can be made dramatic and challenging for sophisticated students but is suitable for an introductory course in electricity and magnetism. (JRH)

Describes the planning and design of King/Drew Magnet High School of Medicine and Science in Los Angeles, which provides students with opportunities to explore careers in health care and science through activities in the classroom and at hospital and science research sites. (EV)

Presents a simple activity to determine the layout of the magnetic poles in a flat rubber or plastic refrigerator magnet. (JRH)

An experiment that highlights the role electrochemistry plays in the fabrication of nanoscale structures is presented. The movement and alignment of the nickel nanowires were observed, when manipulated using magnetic fields through the lens of an optical microscope using common magnets to alter the applied magnetic field.