Hello!!!!!
I just want to ask if how can i kow the numbers of turns of a coil in order to pproduce 12 voltsDCby using only a slow moving magnet...your help is greatly appreciated.....tnx

 

Hi,

The voltage produced by lines of magnetic force cutting the turns of a colil depends on the number of lines of force (magnetic field strength) as well as the velocity.

Without both figures, it is impossible to answer your question.