One ampere current is flowing through a wire. The number of electrons passing through a cross-section of the wire per second is

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1.6 \times 10^{- 19}

6.25 \times 10^{18}

1.6 \times 10^{16}

6.0 \times 10^{23}

answer is B.

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Detailed Solution

One ampere current is flowing through a wire. The number of electrons passing through a cross-section of the wire per second is

6.25 \times 10^{18}

.
Charge on one electron,

(e) = 1.6 \times 10^{- 19}

Current,

I = 1 A

Now, to calculate the number of electrons passing through a cross-section of the wire per second, we use formula
Current,

= ne

, where

n

is number of electrons
Putting the values in the above equation,

\Rightarrow 1 A = n \times 1.6 \times 10^{- 19}

\Rightarrow n = \frac{1}{1.6 \times 10^{- 19}}

\Rightarrow n = 6.25 \times 10^{18}

So, the number of electrons passing through a cross-section of the wire is

6.25 \times 10^{18}

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