A total of 2.0 × 10¹³ electrons pass a given point in a wire in 15 s.What is the current in the wire? (e = 1.60 × 10^-19C) A)1.3 mA B)1.3 A C)0.21 μA D)3.2 μA

Question

Quizplus · Accepted Answer

To find the current, we need to use the formula:

I = Q/t

where I is the current, Q is the charge passing through the point, and t is the time for which the charge flows.

First, we need to find the total charge passing through the point:

Q = ne

where n is the number of electrons and e is the charge on an electron.

Q = (2.0 × 10^19)(1.60 × 10^-19) = 3.2 × 10^-6 C

Now, we can find the current:

I = Q/t = (3.2 × 10^-6 C)/(15 s) = 0.21 μA

Therefore, the best choice is C, 0.21 μA.

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