Question

if a plastic ruler is rubbed vigorously with a woollen cloth then what charge will they get

Answer 1

Answer:

If the plastic ruler is rubbed vigorously with a woolen cloth, then they get both positively and negatively charged.  

Explanation:

When the ruler is rubbed with a woolen cloth, the ruler will get a positive charge and the woolen cloth will get a negative charge. An electric charge is obtained by the rubbing.  

If the ruler is made with plastic, we get to see no reaction, as it is a non-conductor of electric charges.