Question

A glass rod rubbed with silk and was found to have +5 micro coulomb of charge .how many electrons got transferred and from which material?

Is the answer is 3.123*10^13 electrons..

Answer 1

The electron will transfer from glass to the silk
1 electron have a charge of 1.6×10^-19 C charge
so let n electrones give a charge of 5 micro C
so
n×1.6×10^-19=5×10^-6
n=(5/1.6) ×19^13
n=3.125×10^13 electrones
so 3.125×10^ 13 electrones will transfer from glass rod to silk