Why do you say repulsion is the sure test for presence of charge?

Answer 1

A magnet attracts other magnets and also magnetic materials, so just by attraction we can confirm that the material may be a magnet or magnetic material, but repulsion is only possible with magnets for like poles will repel, therefore to test a material is magnet or not we go for repulsion test

Answer 2

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...

Answer 3

Repulsion is stimulated by the knowing/observing of something that disgusts us. Something that is different to what we morally agree with, something that is apart from the norm. Therefore this abstract, this unknown quality attracts us. We as humans are naturally fascinated by that we do not understand, even if we detest it. There is no stronger pull then curiosity, and curiosity draws us to that we do not fully comprehend. As something repulsive, or something disgusting is so often something we don't understand, it can be concluded that repulsion will inevitably lead to magnetism.

Answer 4

To set the stage, when you charge a body, like a balloon, you can attach it to another solid nonconducting object . This occurs despite the nature of the charge on the balloon. So, if a balloon has a negative charge and is brought near an object, like a wall, the charge on the balloon will induce a positive charge on the wall so it will stick to the wall. That means that the wall's electrons (the negative electrons are farther from the positively charged nucleus of the atom) will be repelled by the negatively charged balloon but the nuclei of the atoms in the wall will remain in their original positions. This means that the wall has an induced charge because the electrons have been repelled by the negatively charged balloon and the balloon would be attracted to the wall. This charge induction would also work if the balloon was positively charged.

If the balloon were brought close to an oppositely charged object it would naturally be attracted. But, from the previous paragraph we have already shown that the attraction could be caused by an induced charge rather than an real opposite charge. So the attraction proves nothing concerning the actual effect of charge.

If you have two objects that have been charged with the same type of charge, positive or negative, the objects will repel each other. This is a statement of the law of charge which says that opposite charges attract and like charges repel. No matter what you try, the result will always be repulsion, so the same charges on two objects which causes repulsion will be a proof of, or a sure test, of the presence of the same charge on the objects. Repulsion never happens when a charge is induced by one charged object acting on another.

Answer 5

Of the four forces, only electromagnetic has a repulsive component,

and significant electro-repulsion is difficult to achieve.

Answer 6

I'm guessing it's because repulsion is easier to notice and you can just select one charge at a time to test

Answer 7

this is because repulsion can only take place between two magnets, but attraction can happen with two magnets and a magnet with some other magnetic materials.