Question: ( a ) Show that F = - r | | r | | 3 i s the gradient o f f ( x ,

(a) Show that F=-r||r||3is the gradient of
f(x,y,z)=1r.
(b) What is the work done by the force F=-r||r||3in
moving a particle from a point r0inR3"to,"
where r(x,y,z)=(x,y,z)?
( a ) Show that F = - r | | r | | 3 i s the

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