A TV set picture tube shoots out $6.25 \times 10^{16}$ electrons in one second, then find the current flowing in the TV.
(Charge of an electron is $e = 1.6 \times 10^{- 19} C)$

10 mA

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20 mA

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30 mA

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40 mA

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Solution

The correct option is C
10 mA

Given: Number of electrons $= 6.25 \times 10^{16}$
Time, $t = 1 s$
Charge on one electron, $e = 1.6 \times 10^{- 19} C$

Now, $I = \frac{q}{t}$
and $q = n \times e$ (q is the charge and n is the number of electrons)
$\Rightarrow$ $C u r r e n t, I = \frac{n \times e}{t}$

$\Rightarrow I = \frac{6.25 \times 10^{16} \times 1.6 \times 10^{- 19}}{1}$ $= 10 m A$

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