Question

how will you give permanent positive charge to a conductor by induction

Answer 1

by earthing the conductor on which charge is induced.... when  a charged conductor ( say of positive charge ) is brought near an uncharged conductor  than an opposite charge is induced on the uncharged conductor ( negative charge ) Initially the uncharged conductor was neutral..... but if earthing is done than the positive charge ( the charge opposite to the induced charge )  will go to earth and the body will get  charged.. (this phenomenon should be done in the presence of charged conductor )