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Toroid or sphere?



What effects do a toroid provide, or produce, over solid sphere?  I am building
a small tesla coil, 18" secondary, and was planning to use a 1-1/4" ball
bearing for the termination of the secondary.  I was planning to mount the ball
bearing on top of a stud, that I will thread thru an insulator on top of the
secondary.  Any inputs are appreciated.
 
Thanks,
Stan