Q. Four processes are used to charge an isolated metal sphere.
(i) The sphere is earthed by touching it.
(ii) The earth connection is removed from the sphere.
(iii) A charged rod is brought close to the sphere.
(iv) The charged rod is removed.

Dear Student
   To charge an isolated metal sphere a charged rod is brought close to it. Due to this the charge of opposite nature gets induced on metal sphere.And electricity is the flow of charge(electrons) inside the wires when potential is applied across it and discovered by benjamin franklin.
Hope this information will clear your doubts about topic.

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electricity is discovered by benjamin franklin it is generated by many things like waterand in power houses also
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