Question: Exercise 1 . 1 . Show that grad ( r A ' , r ) = grad ( r A , r ) , that

Exercise 1.1. Show that
grad(rA',r)=grad(rA,r),
that is, the force Fc is indeed independent of the choice of rA.
Exercise 1.1. Show that grad(rA',r)=grad(rA,r), that is, the force Fc is

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