Electric Current

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A current of 2 A flows in a wire, knowing that the elementary charge is 1.6 × 10^{−19}.
How many electrons pass through a cross-section of the wire during a time interval of 1 s?

Suppose that in an experiment of electrochemistry, you remove 1 electron from each set of 10 atoms in a
block of copper of mass *m* = 0.3 kg. The molar mass of copper is 64 g/mol. Determine the total charge
removed from the block.

Data:*Avogadro's number* *N*_{A} = 6.02×10^{23}, the elementary charge of
an electron −1.6.10^{−19} C.

Data:

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