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3 years ago

If 3.2*10^20 electrons pass through a wire in 4s, what would be the electrical current in the wire?

Physics

1 answer:

rewona [7]3 years ago

4 0

Answer: 12.8 A

Explanation:

Current is defined as the rate of flow of electric charge based on the formula:

I(current) = deltaQ(change in charge)/deltat(change in time).

First, however, we must convert the number of electrons into the number of coulombs. Based on the fact that the charge of 1 electron or 1 elementary charge is equal to 1.6*10^-19 C, we can calculate:

3.2*10^20 e = 1.6*10^-19*3*10^20 C = 51.2 C.

Now we use: I = Q/t = 51.2/4 = 12.8 A.

Hope this helped.

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nalin [4]

Answer:

$13 W/m^2$

Explanation:

The apparent brightness follows an inverse square law, therefore we can write:

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$I_1 = 1300 W/m^2$ apparent brightness at a distance $r_1$ , where

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Re-arranging eq.(1), we find $I_2$ :

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snow_tiger [21]

Answer:

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u = Initial velocity

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