Questien ne r 3. eIechu fredd al apomt ? due to miig 9 cheyge oi E. zk2 cwhere z is He distoce 7 pont P m tlhe centesca t, and R is Hre redius 3 mis cohet ii the mogontude7 eSechre fie2d 9t pomi exact9, ) the wing. at the center
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