First slide

electric current

Question

In an electrolyte $3.2 \times 10^{18}$ bivalent positive ions drift to the right per second while $3.6 \times 10^{18}$ monovalent negative ions drift to the left per second. Then the current is

Moderate

A

1.6 A to the left
B

1.6 A to the right
C

0.45 A to the right
D

0.45 A to the left

Solution

$N e t c u r r e n t i_{n e t} = i_{(+)} + i_{(-)}$
$\begin{array}{l} = \frac{n_{(+)} q_{(+)}}{t} + \frac{n_{(-)} q_{(-)}}{t} \\ = \frac{n_{(+)}}{t} \times 2 e + \frac{n_{(-)}}{t} \times e \\ = 3.2 \times 10^{18} \times 2 \times 1.6 \times 10^{- 19} + 3.6 \times 10^{18} \times 1.6 \times 10^{- 19} \end{array}$
1.6 A (towards right)

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