A glass rod rubbed with silk acquires a charge of +8*10(power -12).the number of electrons it has gained or lost is what?
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The glass rod has aquired a +ve charge, which implies electrons were lost from it.
Now , 1electron has a charge of -1.6X10⁻¹⁹C
if the charge present is 8X10⁻¹²C
then no. of electrons lost = \frac{total  charge  present }{  charge  on  each  electron}  \\  \frac{8X10 ^{-12} }{1.6X10^{-19} }  \\ =5X10^{7} C