A building has different types of openings, such as windows and doors. Do you think a cell also has a different type of openings
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The plastic rod is made of insulator (plastic), so it does not allow charges moving from one sphere to another. This means that all the electrons given to sphere A will remain on sphere A.
The number of electrons initially given to sphere A is
, and since the charge of 1 electron is 
, the net charge left on sphere A after the removal of the rod will be
The number of electrons initially given to sphere A is