1)HOW MANY ELECTRONS MAKE 10 COULOMB OF CHARGE

We know that charge on an electron is 1.6 X 10^-19C. Thus

Number of electrons in 1.6 X 10^-19C of charge = 1

Number of electrons in 1 C of charge = 1 / ( 1.6 X 10^-19)

Number of electrons in 10 C of charge = (1 X 10) / ( 1.6 X 10^-19)= 6.25 X 10¹⁹

Thus there are 6.25 X 10¹⁹electrons in 10 C of charge.

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