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Resposta:
d) 0,24 (J)
Explicação:
Wab = q . U
Wab = 2 . 10^-3 . (60 - 0)
Wab = 2.10^-3 . 60
Wab = 120 . 10^-3
Wbc = q . U
Wbc = 2 . 10^-3 . (0 - (-60) )
Wbc = 2.10^-3 . 60
Wbc = 120 . 10^-3
Wad = Wab + Wbc
Wad = 120 . 10^-3 + 120.10^-3
Wad = 240 . 10^-3
Wad = 24.10^-2
Wad = 24/100
Wab = 0,24 (J)