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ALL PHYSICS DOUBTS - POST HERE !!

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Shazizzzle:

--- Quote from: igext on May 25, 2010, 07:37:58 pm ---can some one tell me what is the purpose of the core in a transformer?

--- End quote ---

The core is mainly made of iron, A CONDUCTOR, and so, serves as the purpose of CONDUCTING or TRANSFERRING the current from the primary coil to the secondary. It helps with the electromagnetic induction. As a conductor, to allow and speed up the transfer of current process, and it itself is induced.

The core is also made of pieces which are joint via lamination, and not just one whole piece, to avoid building up of eddy current.

igext:

--- Quote from: ~VIN1094~ on May 25, 2010, 07:42:06 pm ---the voltage induces in the core itself .. without it the transformer wouldnt work ..

--- End quote ---
my teacher said the current is directly induced in the 2ndry coil with out the help of the core

Adzel:
see attached...

the_grim_reaper:

--- Quote from: ~VIN1094~ on May 25, 2010, 07:34:58 pm ---ok u said "a capacitor won't charge with AC cause it will prevent accumulation of charges right??" PERFECT!

 " Meaning it will charge and discharge"  i dont think it will charge on the first place because the to and fro is so fast tht the capacitor wont be able to have enough time to get charged .. ;)

" And to produce an induced EMF, is it necessary to use an alternating field (the one provided by AC)?? Since DC will not produce an alternating field and no induced EMF right????"   yup this is right .. do you know WHY ac is needed for induced pd ??

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THanks!!! Ummm since only AC can produce an alternating magnetic field only that can produce an induced EMF?? Lenz's law says that the direction of the induced EMF should be to oppose the change causing it so the field by DC will not induce an EMF since it won't oppose the change causing it?? HAHAHAHAHAHAH LOL. I don't know :D.

33oomar:
Guys.. I need help in
question 39   may/june 2007 paper 1
Please help meeeeee :(

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