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3) Aluminium is trivalent with atomic weight 27 g/mole and density 2.7×10³ kg/m³, whilst
the mean free time between collision is 4x10-¹4 s. Calculate the current flowing through an
aluminium, wire 10 m long and 1 mm² cross-sectional area when a potential of 2 V is applied
at its ends.

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