Tagged Questions
1
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2answers
118 views
Why energy saving light bulbs contain rare earth?
Reading a french article talking about a recycling unit of rare earth from energy saving light bulbs near Lyon - France (here is the official press release of the Salvay company), I was wondering :
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3
votes
4answers
2k views
In electrostatics, why the conductor is an equipotential surface?
Since the electric field inside a conductor is zero that means the potential is constant inside a conductor, which means the "inside" of a conductor is an equipotential region.
Why books conclude ...
3
votes
3answers
4k views
In electrostatics, why the electric field inside a conductor is zero?
In electromagnetism books, such as Griffiths or the like, when they talk about the properties of conductors in case of electrostatics they say that the electric field inside a conductor is zero.
I ...
1
vote
1answer
419 views
Properties to select suitable materials for making permanent magnets
I have read that soft iron is suitable for making a permanent magnet. Because it is required for permanent magnet to have high coercivity and high retentivity.
Same text also said earlier that soft ...
1
vote
0answers
129 views
Electrical machines: electrical and mechanical properties of steels and cast iron
I would like to know a good source of information for the common metals (steels and cast iron). Information that I need are basically the mass density and the electrical conductivity or resistivity. ...
