Physics

Problem

A thin copper wire carries current in two stages: • Stage 1: a steady current of

+3.0\,\text{A}

flows for

2\,\text{min}

. • Stage 2: a current of

-1.5\,\text{A}

(opposite direction) flows for the next

4\,\text{min}

. a. (i) Taking the direction of Stage 1 current as positive, calculate the net charge transported through any cross-section during the entire

6\,\text{min}

. b. (ii) Find separately the number of electrons that pass the cross-section in Stage 1 and in Stage 2. c. (iii) Determine the magnitude and direction of the average current for the whole

6\,\text{min}

interval. d. (iv) Explain the importance of algebraic sign in your answers to parts (i) and (iii).

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