Question

repulsion is sure test for electrification. explain?

Answer 1

When you use repulsion as a test for electrification, it's talking about induction. By charging by induction, you give the secondary object the opposite charge hence causing the two to push away from each other.

Answer 2

If two objects are repelling, it is a confirmation of the fact they are charged

Answer 3

if u have read about charging a body by induction u must have observed that when we place the charged body near a neutral body the neutral body accuires a charge opposite to that of the charged body hence they attract each other,even though the body is still neutral as it has same no.s of +VE and -VE charge but only distribution is different so we can never say that if 2 bodies are being attracted it means that both of them are electrically active but in the case of repulsion its not so...