Recent content by NUMB_NUTS

Hi i hope you can help me? My question is: Given the relationships: B/h = U, H = IN/l and L = N x dphi/dI {ie, L = N x change in phi/change in I}. show that the inductance of the coil is: L = Nsquared/S Where S = l/uA ?? .l is lower case L...

Many thanks for taking the time. I've noted your advice and will take a good look around before i consider any more posts. Once again thanks for your help (and the welcome). Cheers

many thanks i'll take a look and hopefully they will be of help. Cheers.

Hi, could anyone please let me know of any books that explain electromagnetic theory. Unfortunately a lot of books seem to be written for people who already know the subject well.Probably teaching aids i think. I am in s/e/asia but not a problem as i can always look up ebay. any suggestions...

many thanks

many thanks for your help.

help needed please?? please open in word. thanks.

electromagnet problem, need help please! Q1, I need to calculate the value of B required to lift a plate. Q2, Estimate the mmf F required to lift the same plate. I understand P = B squared x A. divided by 2 x permeability of free space. This is what I have to work with: The...

:rolleyes: Can anyone tell me the main attributes of: a loud speaker magnet? a compass needle? In terms of permeability, remanence etc. many thanks

Thanks For Your Reply. I WILL TRY EXPLAIN MY QUESTION AND PRESENT YOU WITH ALL THE FACTS I HAVE AT MY DISPOSAL. In the question it is first mentioned that the pull,P, exerted at each pole of the magnet is given by the equation: P = Bsquared x A divided by 2 x permeability of free space. A...

HI EVEYONE, NEED TO TAALK TO SOMEONE WHO IS UP ON CALCULATING THE VALUE OF (B), REQUIRED TO LIFT A PLATE OF XXNEWTONS. ALSO ESTIMATE THE M.M.F REQUIREDTO LIFT THE SAME PLATE. ANY TAKERS PLEASE? THANKS