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Image for When you press one of the buttons on a pocket calculator, the battery provides a current of 300 Mu A for 10 ms
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Answer #1

a) Q = i*t

= 300*10^-6*10*10^-3

= 3*10^-6 C

b) no of elctrons = 3*10^-6/(1.6*10^-19)

= 1.875*10^13

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Answer #2

Charge = current* time

Charge=(300*10^-6)*(10*10^-3)=3*10^-6 coloumb

Charge on 1 electron= 1.6*10^-19 coloumb

No of electron=3*10^-6/(1.6*10^-19)=1.875*10^13

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