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  • A wire carries a current of 2.0 A. What is the charge that has flowed through its cross– section in 1.0 s. How many electrons does this correspond to?Optio

A wire carries a current of 2.0 A. What is the charge that has flowed through its cross– section in 1.0 s. How many electrons does this correspond to?

Option: 1

3.0\; C, 1.25\times 10^{19}


Option: 2

2.0\; C, 1.25\times 10^{19}


Option: 3

4.0\; C, 1.25\times 10^{19}


Option: 4

2.0\; C, 5.25\times 10^{19}


Answers (1)

best_answer

\begin{array}{ll} i=\frac{q}{t} & \\ \therefore & q=i t=(2.0 \mathrm{a})(1.0 \mathrm{~s})=2.0 \mathrm{C} \\ & \mathrm{q}=\mathrm{ne} \\ \therefore & \mathrm{n}=\frac{\mathrm{q}}{\mathrm{e}}=\frac{2.0}{1.6 \times 10^{-19}}=1.25 \times 10^{19} \end{array}

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