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Question

A current of 1Ais drawn by a filament of an electric bulb. The number of electrons passing through a cross-section of the filament in 16seconds would be roughly?


A

1020

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B

1016

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C

1023

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D

1018

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Solution

The correct option is A

1020


Explanation for the correct option A: 1020

Step 1: Given data

Electric current flowing through the filament, i=1A

Number of electrons passing through the filament, n=?

Time duration in which the electrons flow through the filament, t=16s

Step 2: Formula used

i=n×et

n=i×te …………………….(a)

Where, (e) is the charge on the electron.

e=1.6×10-19C

Step 3: Calculation of the number of electrons flowing through the filament

Substituting the given values in equation (a), we get

n=1A×16s1.6×10-19Cn=1×1616×10-20n=1020

Hence, option (A) is correct.


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