Recent content by cmb323

The change in flux in Faradays Law is on a per coil basis; therefore the rate of change of the flux with respect to time is preceded by N – the number of turns on the solenoid. To get the answer to the problem in the text n in the equation needs to be the number of turns on the solenoid. However...

The life preserver just was pulled out of my reach – transformers are yet to come in my tortuous journey through electromagnetism. With regard to the flux I believe you saying that the flux through the solenoid is the same as the flux through the ring – agree. Then despite my misgivings then...

Great explanation, but I think I went straight to the deep end – thanks for the life preserver. The equation that was used to find the emf in the problem was µ0nπr2(di/dt). So from what you have stated I assume this is was a correct application?

The ring is far from the ends of the solenoid, and I agree that there is a changing flux enclosed by the ring. The problem (in a famous textbook) that caused me to question the validity of the emf equation had r = 0.01 m and R = 0.02 m. Since r is close to R perhaps a simplifying assumption that...

Thank you. I see how Faraday’s Law would work inside of the solenoid. However, there is no magnetic field outside the solenoid so the electrons in the external ring have no clue that the solenoid exists. Therefore is seems wrong to use the following equation to find the emf in the ring Emf =...

I can “plug and chug” into the equations and answer the question, but it is the “why” that concerns me. As a consequence the current, number of turns, etc. does not change the question. Your statement “…R doesn’t appear, because it is immaterial” is the question. I’m struggling to believe that...

I can’t provide a diagram. However, the solenoid and conducting coil are on the same axis. As a result the magnetic field lines inside the solenoid are perpendicular to the face of conducting coil. Hopefully not too many typos in the following. Outside the solenoid R > r E =...

Homework Statement [/B] A conducting coil of radius R is outside a long solenoid with a cross section of radius r. What is the emf induced in the coil? Most example problems of this type I think are solved based on Faraday’s Law. These examples do not use the distance from the solenoid to the...