In the process of charging by friction, the body must Cloze (1): JXUwMDJhJXUwMDA3JXUwMDE3 on an another body to get electric charges and the body must be an insulator.

Physical contact is needed for conductors to be charged in the process of charging by Cloze (2): JXUwMDNiJXUwMDBjJXUwMDAxJXUwMDBhJXUwMDExJXUwMDE2JXUwMDE3JXUwMDFkJXUwMDA2JXUw MDAx .

But in charging by Cloze (3): JXUwMDMxJXUwMDA3JXUwMDBhJXUwMDExJXUwMDE2JXUwMDE3JXUwMDFkJXUwMDA2JXUwMDAx , there is no physical contact is required for charging.

In this method, a Cloze (4): JXUwMDNiJXUwMDBjJXUwMDAxJXUwMDBhJXUwMDExJXUwMDE2JXUwMDE3JXUwMDFiJXUwMDFk acquires electric charge by bringing the electrically charged body near to that material.

To be charged positively for a conductor, we need a Cloze (5): JXUwMDM2JXUwMDBiJXUwMDAyJXUwMDA2JXUwMDE1JXUwMDFkJXUwMDFmJXUwMDEzJXUwMDA5JXUw MDE1 charged object in equal amount.

Charging by induction method is used in real life in 
Cloze (6):

JXUwMDNiJXUwMDBiJXUwMDA5JXUwMDEzJXUwMDE1JXUwMDBlJXUwMDA3JXUwMDA5

 microphones, smartphones etc