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Graduate Problem with use of 'velocity' of charged particle in lorentz force eq

Apr 29, 2013 · Replies 2 · Apr 30, 2013

Replies: 2

Views: 2K

Undergrad Test charge in electric and magnetic field

Apr 30, 2013 · Replies 2 · Apr 30, 2013

Replies: 2

Views: 2K

Undergrad Calculating Magnet Field for Solenoid and Horseshoe Magnet: What Am I Missing?

Apr 29, 2013 · Replies 7 · Apr 30, 2013

Replies: 7

Views: 2K

High School Zero speed due to air resistance

Apr 29, 2013 · Replies 4 · Apr 30, 2013

Replies: 4

Views: 2K

Undergrad What do the gradient magnets do on MRI scanners?

Apr 29, 2013 · Replies 2 · Apr 29, 2013

Replies: 2

Views: 2K

Undergrad Why do different gauss meters measure magnetic field strength differently

Oct 6, 2012 · Replies 8 · Apr 29, 2013

Replies: 8

Views: 7K

Undergrad Ampere's Law physical significance

Apr 21, 2013 · Replies 15 · Apr 29, 2013

Replies: 15

Views: 6K

Undergrad What gives the electron the energy to continuosly orbit

Apr 28, 2013 · Replies 7 · Apr 28, 2013

Replies: 7

Views: 2K

Graduate Applying the conservation of energy law to electrical circuits.

Apr 27, 2013 · Replies 6 · Apr 28, 2013

Replies: 6

Views: 13K

High School Quetion about direction of magnetic field lines

Apr 28, 2013 · Replies 6 · Apr 28, 2013

Replies: 6

Views: 3K

Undergrad Do Electrons Orbit Nuclei at the Same Distance?

Apr 27, 2013 · Replies 5 · Apr 28, 2013

Replies: 5

Views: 2K

High School Parallel/Series Combination Circuits

Apr 28, 2013 · Replies 3 · Apr 28, 2013

Replies: 3

Views: 2K

Undergrad How to Calculate Windings for a 1 T Solenoid Electromagnet with Iron Core

Apr 27, 2013 · Replies 4 · Apr 28, 2013

Replies: 4

Views: 2K

Graduate Can Electric Fields be Discontinuous? - Conservation of Charge

Apr 26, 2013 · Replies 6 · Apr 28, 2013

Replies: 6

Views: 2K

Graduate Electron Diffraction: Polycrystalline vs Monocrystal

Apr 27, 2013 · Replies 5 · Apr 27, 2013

Replies: 5

Views: 2K

Undergrad Why is there a contradiction in the signs for electrical potential equations?

Apr 27, 2013 · Replies 1 · Apr 27, 2013

Replies: 1

Views: 2K

Undergrad Optimizing DC Current Through Neodymium Magnets for Efficient Power Transfer

Apr 26, 2013 · Replies 5 · Apr 27, 2013

Replies: 5

Views: 5K

Undergrad Falling Objects and Air Resistance

Apr 27, 2013 · Replies 3 · Apr 27, 2013

Replies: 3

Views: 3K

Undergrad Electricity Q&A: About Electrification

Apr 24, 2013 · Replies 2 · Apr 27, 2013

Replies: 2

Views: 2K

Graduate Finding Magnetic Field for Infinite Sheet Concept

Apr 27, 2013 · Replies 1 · Apr 27, 2013

Replies: 1

Views: 2K

Undergrad Where does an electron's kinetic energy go?

Apr 25, 2013 · Replies 4 · Apr 27, 2013

Replies: 4

Views: 2K

Undergrad Determining resistance of oscilloscope.

Apr 26, 2013 · Replies 16 · Apr 27, 2013

Replies: 16

Views: 11K

Undergrad What is the acoustic power output of a blue whale in Watts?

Apr 9, 2013 · Replies 8 · Apr 26, 2013

Replies: 8

Views: 9K

Graduate Could capacitors ever rival best batteries?

Feb 15, 2013 · Replies 14 · Apr 26, 2013

Replies: 14

Views: 3K

Undergrad How can I optimize my electro magnet?

Apr 26, 2013 · Replies 4 · Apr 26, 2013

Replies: 4

Views: 2K

Undergrad Gauss theorem and the nature of the surface

Apr 24, 2013 · Replies 7 · Apr 26, 2013

Replies: 7

Views: 2K

Graduate Surface impedance - Boundary condition

Apr 24, 2013 · Replies 1 · Apr 26, 2013

Replies: 1

Views: 2K

Undergrad How come potential energy is negative when charges attract

Apr 26, 2013 · Replies 1 · Apr 26, 2013

Replies: 1

Views: 4K

Undergrad Interpreting Hall Effect Equation Physically: B & V

Apr 23, 2013 · Replies 4 · Apr 25, 2013

Replies: 4

Views: 2K

Graduate Electromagnetism coupled with continuum mechanics

Apr 25, 2013 · Replies 3 · Apr 25, 2013

Replies: 3

Views: 2K

High School Can Adding an Electron Change the Properties of a Hydrogen Atom?

Apr 25, 2013 · Replies 1 · Apr 25, 2013

Replies: 1

Views: 2K

Graduate Acoustic communication impossible in even-D

Apr 24, 2013 · Replies 9 · Apr 25, 2013

Replies: 9

Views: 3K

Undergrad Calculate Current for 5V Sinusoidal Input Voltage

Apr 23, 2013 · Replies 27 · Apr 25, 2013

Replies: 27

Views: 3K

High School How Do Magnets Generate Forces?

Apr 24, 2013 · Replies 2 · Apr 25, 2013

Replies: 2

Views: 1K

Undergrad Electric field direction and permittivity

Apr 24, 2013 · Replies 6 · Apr 25, 2013

Replies: 6

Views: 2K

Undergrad Coulomb's Third Law of Friction

Apr 24, 2013 · Replies 1 · Apr 24, 2013

Replies: 1

Views: 2K

Graduate Confusion on Continuity of Current and Free Charge in Conductor

Apr 19, 2013 · Replies 6 · Apr 24, 2013

Replies: 6

Views: 2K

Graduate How is the alternating electric potential produced in cyclotrons?

Apr 20, 2013 · Replies 6 · Apr 23, 2013

Replies: 6

Views: 2K

Undergrad I don't understand this equation

Apr 21, 2013 · Replies 8 · Apr 23, 2013

Replies: 8

Views: 2K

Undergrad Calculating Current in a Diode Circuit with Given Voltages

Apr 17, 2013 · Replies 10 · Apr 23, 2013

Replies: 10

Views: 3K

Graduate How Is Energy Flux Calculated in an Electromagnetic Wave?

Apr 22, 2013 · Replies 2 · Apr 22, 2013

Replies: 2

Views: 3K

Undergrad Electromagnetic wave propagation when blocked by metal

Apr 17, 2013 · Replies 5 · Apr 22, 2013

Replies: 5

Views: 3K

Undergrad Is the Electric Field Inside an Irregular Shaped Conductor Always Zero?

Apr 19, 2013 · Replies 3 · Apr 21, 2013

Replies: 3

Views: 2K

Undergrad AC circuits - Complex vs Ordinary notation

Apr 20, 2013 · Replies 5 · Apr 21, 2013

Replies: 5

Views: 2K

Graduate Couple of Questions Regarding EM Waves

Apr 21, 2013 · Replies 1 · Apr 21, 2013

Replies: 1

Views: 1K

Undergrad Does a bifilar coil cancel its own magnetic field?

Apr 19, 2013 · Replies 6 · Apr 20, 2013

Replies: 6

Views: 4K

Undergrad Faraday's law. Induced electric field.

Apr 20, 2013 · Replies 2 · Apr 20, 2013

Replies: 2

Views: 2K

Graduate Is there always a phase shift between current and voltage in an RLC circuit?

Apr 20, 2013 · Replies 1 · Apr 20, 2013

Replies: 1

Views: 2K

Graduate Voltage measured across a capacitor with embedded charges

Apr 19, 2013 · Replies 8 · Apr 20, 2013

Replies: 8

Views: 2K

High School Electric circuits/voltage/resistor

Apr 20, 2013 · Replies 1 · Apr 20, 2013

Replies: 1

Views: 2K

High School Understanding Current: Definition and Comparison to Math-Defined Current

Apr 19, 2013 · Replies 4 · Apr 20, 2013

Replies: 4

Views: 2K

Undergrad Is Maxwell's third law the proof of conservation of energy in E&M?

Apr 19, 2013 · Replies 2 · Apr 19, 2013

Replies: 2

Views: 3K

Graduate Solving Low Resistance Problem to Generate Magnetic Field

Apr 17, 2013 · Replies 9 · Apr 19, 2013

Replies: 9

Views: 3K

Graduate Magnetic field = 0 inside a conducting wire?

Apr 19, 2013 · Replies 1 · Apr 19, 2013

Replies: 1

Views: 2K

Graduate Voltage Vector/Scalar Components, SI Units, Direction and Polarity.

Apr 18, 2013 · Replies 1 · Apr 19, 2013

Replies: 1

Views: 5K

Undergrad How to calculate power output in piezoelectric material?

Mar 10, 2013 · Replies 2 · Apr 19, 2013

Replies: 2

Views: 7K

Undergrad Direction of magnetic field inside infinite slab

Apr 17, 2013 · Replies 1 · Apr 19, 2013

Replies: 1

Views: 3K

Graduate How do I calculate the necessary force for my solenoid and return spring?

Apr 17, 2013 · Replies 4 · Apr 18, 2013

Replies: 4

Views: 5K

Graduate Is E in Maxwell-Equations really E ?

Apr 18, 2013 · Replies 11 · Apr 18, 2013

Replies: 11

Views: 3K

High School Troubleshooting Circuit with Kirchhoff's Laws

Apr 16, 2013 · Replies 3 · Apr 18, 2013

Replies: 3

Views: 2K

Undergrad Relationship between force and Velocity in Magnetic Fields

Apr 17, 2013 · Replies 10 · Apr 18, 2013

Replies: 10

Views: 6K

High School Is the Earth's Magnetic Field strong and does it fluctuate a lot

Apr 17, 2013 · Replies 2 · Apr 17, 2013

Replies: 2

Views: 2K

Graduate Recovering WWII magnetic amplifier technology

Apr 5, 2013 · Replies 8 · Apr 17, 2013

Replies: 8

Views: 4K

Undergrad Faraday's law and gauss's law for magnetism apparent contradiction

Apr 17, 2013 · Replies 3 · Apr 17, 2013

Replies: 3

Views: 5K

High School Why don't fluorescent bulbs blow up when electricity is connected?

Apr 15, 2013 · Replies 15 · Apr 17, 2013

Replies: 15

Views: 4K

Graduate Do magnetic fields have any effect on dielectric breakdown

Apr 16, 2013 · Replies 1 · Apr 17, 2013

Replies: 1

Views: 2K

Undergrad How Do You Determine Magnetic Force Direction When Fields Aren't Perpendicular?

Apr 16, 2013 · Replies 2 · Apr 17, 2013

Replies: 2

Views: 2K

Undergrad Uniqueness Theorem in Electrostatics - Explanation

Apr 15, 2013 · Replies 1 · Apr 17, 2013

Replies: 1

Views: 2K

Undergrad Electric field and gauss law for different models of sphere

Apr 17, 2013 · Replies 3 · Apr 17, 2013

Replies: 3

Views: 2K

Undergrad Please answer i have a test in 11 hours

Apr 16, 2013 · Replies 5 · Apr 17, 2013

Replies: 5

Views: 2K

Undergrad 2 solenoids: emf and frequency

Apr 16, 2013 · Replies 1 · Apr 16, 2013

Replies: 1

Views: 1K

Graduate What Magnetic field is generated

Apr 16, 2013 · Replies 8 · Apr 16, 2013

Replies: 8

Views: 2K

Undergrad Electric field due to infinite sheet

Jan 28, 2012 · Replies 3 · Apr 16, 2013

Replies: 3

Views: 8K

Graduate Why is there current induced on Faraday's disk?

Apr 16, 2013 · Replies 2 · Apr 16, 2013

Replies: 2

Views: 2K

Undergrad Conversion of Voltage into Radiation counts

Apr 13, 2013 · Replies 12 · Apr 16, 2013

Replies: 12

Views: 2K

Undergrad Calculating the Field strength of a magnet at a certain distance

Apr 15, 2013 · Replies 1 · Apr 16, 2013

Replies: 1

Views: 4K

Undergrad Altitude where Earth's magnetic field will no longer affect a compass

Apr 14, 2013 · Replies 9 · Apr 15, 2013

Replies: 9

Views: 11K

Undergrad Dipole - the calc. seems a bit illogical though correct

Apr 15, 2013 · Replies 2 · Apr 15, 2013

Replies: 2

Views: 1K

High School One misconception about magnets

Apr 15, 2013 · Replies 1 · Apr 15, 2013

Replies: 1

Views: 3K

Graduate Could a magnetic charge make free energy?

Apr 14, 2013 · Replies 3 · Apr 15, 2013

Replies: 3

Views: 2K

Undergrad Idea of efficient electricity generating system model?

Apr 14, 2013 · Replies 1 · Apr 14, 2013

Replies: 1

Views: 2K

Undergrad Attraction between a charge and a magnet

Apr 14, 2013 · Replies 10 · Apr 14, 2013

Replies: 10

Views: 9K

Undergrad How exactly do generators work (Please explain the Faraday's law)

Apr 14, 2013 · Replies 2 · Apr 14, 2013

Replies: 2

Views: 2K

High School What material is a poor conductor of electricity?

Apr 13, 2013 · Replies 13 · Apr 14, 2013

Replies: 13

Views: 14K

Undergrad Frequency does not matter for the "lag" ?

Apr 13, 2013 · Replies 6 · Apr 14, 2013

Replies: 6

Views: 3K

Graduate Self consistent maxwells equations

Apr 13, 2013 · Replies 1 · Apr 14, 2013

Replies: 1

Views: 2K

Undergrad What happens to power when voltage is negative

Apr 13, 2013 · Replies 10 · Apr 13, 2013

Replies: 10

Views: 2K

High School Need help with making sphere electromagnet

Apr 13, 2013 · Replies 22 · Apr 13, 2013

Replies: 22

Views: 6K

Graduate Help with physics of my Magnet Motor

Apr 12, 2013 · Replies 3 · Apr 13, 2013

Replies: 3

Views: 2K

Undergrad Electrical resistivity tomography

Apr 13, 2013 · Replies 1 · Apr 13, 2013

Replies: 1

Views: 2K

Undergrad Calculating electrical energy over time

Apr 12, 2013 · Replies 7 · Apr 13, 2013

Replies: 7

Views: 2K

High School Measuring RF Frequency in Hertz for Science Projects

Apr 11, 2013 · Replies 8 · Apr 13, 2013

Replies: 8

Views: 2K

Graduate Calculation of the magnetic field ring current and the magnetic flux t

Apr 13, 2013 · Replies 2 · Apr 13, 2013

Replies: 2

Views: 2K

High School Refuting Perpetual Motion with Magnets

Apr 13, 2013 · Replies 1 · Apr 13, 2013

Replies: 1

Views: 2K

Undergrad Why is the magnetic field perpendicular to the force?

Apr 11, 2013 · Replies 4 · Apr 13, 2013

Replies: 4

Views: 2K

Undergrad The units for current density don't check out

Apr 12, 2013 · Replies 3 · Apr 12, 2013

Replies: 3

Views: 2K

Graduate L Science - Understanding Electron Orbitals and Their Role in Atomic Structure

Apr 12, 2013 · Replies 6 · Apr 12, 2013

Replies: 6

Views: 2K

Graduate What is the nature of electric charge and how does it relate to string theory?

Apr 10, 2013 · Replies 12 · Apr 12, 2013

Replies: 12

Views: 3K

Undergrad Do External Electric Fields Penetrate Conductors with Cavities?

Apr 11, 2013 · Replies 8 · Apr 12, 2013

Replies: 8

Views: 4K

Undergrad Magnetic Susceptibility VS. Relative Permeability

Apr 11, 2013 · Replies 3 · Apr 11, 2013

Replies: 3

Views: 6K

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