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question bank
question bank

The Magnetic Field Induced by a Lightning Strikes Indirect Effect
The Magnetic Field Induced by a Lightning Strikes Indirect Effect

Edward M. Purcell - Nobel Lecture
Edward M. Purcell - Nobel Lecture

PHY481 - Lecture 5: Electrostatics
PHY481 - Lecture 5: Electrostatics

physics-132-70-chap-22-eod
physics-132-70-chap-22-eod

... Faraday’s Law of Electromagnetic Induction ...
KISS Notes
KISS Notes

... direction, the force will d)......................... the wires. If the current flow e)............................, the force will f)............................... the wires. The magnitude of the force per unit of g).................... is proportional to h).................................... in ...
list of faq questions in physics unit 1,2,3 three
list of faq questions in physics unit 1,2,3 three

... difference. 11. Define - Electric potential at a point. 12. What is meant by equipotential surface? 13. Define electric flux? 14. State Gauss's law. 15. Define-Capacitance. Give its expression. 16. What is a non - polar molecule? Give examples. 17. What is a polar molecule? Give examples. 18. What a ...
OVERVIEW: Electromagnetism
OVERVIEW: Electromagnetism

Calculate Inductor AC Flux Density
Calculate Inductor AC Flux Density

... Permeability here is expressed as relative permeability times the permeability constant μ = μ r μ 0 = μ r⋅4 π⋅10−7 H / m . The magnetic path length here is magnified by the presence of a gap in the magnetic path: l = l m + μ l g where l m is the path length in the magnetic material and l g is the pa ...
Q # 1. The potential is constant throughout a given region of space
Q # 1. The potential is constant throughout a given region of space

What`s This Thing Called “Current”?
What`s This Thing Called “Current”?

PHYS4315: Electromagnetic Field Theory 2.
PHYS4315: Electromagnetic Field Theory 2.

A possible catalytic nuclear fusion owing to weak interactions I
A possible catalytic nuclear fusion owing to weak interactions I

Powerpoint
Powerpoint

Dielectric Heating with Microwave Energy - Püschner
Dielectric Heating with Microwave Energy - Püschner

Document
Document

... They do not, as in Newton’s laws, connect two widely separated events; they do not connect the happenings here with the conditions there”. “The field here and now depends on the field in the immediate neighborhood at a time just past. The equations allow us to predict what will happen a little furth ...
Journal of Physics Special Topics
Journal of Physics Special Topics

A moving electric charge is surrounded by a magnetic field.
A moving electric charge is surrounded by a magnetic field.

... • The current is reversed during each half revolution by means of stationary contacts on the shaft. • The parts of the wire that brush against these contacts are called brushes. • The current in the loop alternates so that the forces in the upper and lower regions do not change directions as the loo ...
36 Magnetism - KaiserScience
36 Magnetism - KaiserScience

A moving electric charge is surrounded by a magnetic field.
A moving electric charge is surrounded by a magnetic field.

36 Magnetism - scienceosuji
36 Magnetism - scienceosuji

... • The current is reversed during each half revolution by means of stationary contacts on the shaft. • The parts of the wire that brush against these contacts are called brushes. • The current in the loop alternates so that the forces in the upper and lower regions do not change directions as the loo ...
36 Magnetism
36 Magnetism

... • The current is reversed during each half revolution by means of stationary contacts on the shaft. • The parts of the wire that brush against these contacts are called brushes. • The current in the loop alternates so that the forces in the upper and lower regions do not change directions as the loo ...
36 Magnetism - Midland Park School District
36 Magnetism - Midland Park School District

... • The current is reversed during each half revolution by means of stationary contacts on the shaft. • The parts of the wire that brush against these contacts are called brushes. • The current in the loop alternates so that the forces in the upper and lower regions do not change directions as the loo ...
Ch36 - Southwest High School
Ch36 - Southwest High School

... • The current is reversed during each half revolution by means of stationary contacts on the shaft. • The parts of the wire that brush against these contacts are called brushes. • The current in the loop alternates so that the forces in the upper and lower regions do not change directions as the loo ...
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Eddy current

Eddy currents (also called Foucault currents) are circular electric currents induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor. The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.By Lenz's law, an eddy current creates a magnetic field that opposes the magnetic field that created it, and thus eddy currents react back on the source of the magnetic field. For example, a nearby conductive surface will exert a drag force on a moving magnet that opposes its motion, due to eddy currents induced in the surface by the moving magnetic field. This effect is employed in eddy current brakes which are used to stop rotating power tools quickly when they are turned off. The current flowing through the resistance of the conductor also dissipates energy as heat in the material. Thus eddy currents are a source of energy loss in alternating current (AC) inductors, transformers, electric motors and generators, and other AC machinery, requiring special construction such as laminated magnetic cores to minimize them. Eddy currents are also used to heat objects in induction heating furnaces and equipment, and to detect cracks and flaws in metal parts using eddy-current testing instruments.
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