[quote author=Fu-Kwun Hwang link=topic=33.msg7438#msg7438 date=1287740821]
[quote author=Zahraa link=topic=33.msg7436#msg7436 date=1287723437]
thank you again ...

but all the articles I have read about the cyclotron say : that the charged particles is effected with tow filed in the gap
magnetic and electric one ..


Can you provide reference to the articles you read? Or copy the full text in detail?

see these pictures and notice that  the magnetic filed cross the gap.