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Sagot :

1)

on a g = f/m

fa = g(A)*m' ou fa = 2j

fb = g(B)*m' ou fb = 1i

fc = g(C)*m' ou fc = -3i

2a)

On a un champs électrostatique attractif, donc q < 0 ( est de charge négative )

2b)

on a E = f/|q|

fa = E(A)*e ou fa = 2j

fb = E(B)*e ou fb = 1i

fc = E(C)*e ou fc = -3i

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