i n N (+ )
( + ) = +
( - ) ( - ) = - +
( + ) ( - ) =
-
i f th e m a g n e t p o l e o f e a r th e h a s th e + w e s h ou l d do +
- to -
th e newt o n 's l a w th e s tre n gh t f th e f tha t c a t ch th e s p ac e c hi pi n e a r the w e s h o u l d p u t f1 mo r e t han f t o p ut s pa c e s h i p o f f
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