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Question

A TV set picture tube shoots out 6.25×1016 electrons in one second, then find the current flowing in the TV.
(Charge of an electron is e=1.6×1019 C)


A

10 mA

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B

20 mA

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C

30 mA

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D

40 mA

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Solution

The correct option is A

10 mA


Given: Number of electrons =6.25×1016
Time, t=1 s
Charge on one electron, e=1.6×1019 C

Now, I=qt
and q=n×e (q is the charge and n is the number of electrons)
Current,I=n×et

I=6.25×1016×1.6×10191=10 mA


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