1. The aluminium strips in an electroscope are replaced by plastic strips and a charged body is brought in contact with the metal clip. What will happen?
 
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If aluminium strips are replaced by plastic strips, then  of the strips will take place, we  whether the object is charged or not.
 
2. Plastic straws A and B are rubbed with dry cotton cloth. What will happen, if they are brought near each other?
 
When plastic straws A and B are rubbed with a dry cotton cloth, they will acquire the , so they  each other.