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The electrical charges

Evidence

The experiment shows that

There exist two kinds of charges: positive (+) and negative (-) Same sign charges repell each other, opposite sign charges attract each other

Deviation in an electric field

In an electric field: A negatively charged particle is attracted by the positive plate A positively charged particle is is attracted by the negative plate.

Deviation in a magnetic field

In a magnetic field: A positively charged particle is deviated as shown A negatively charged particle is deviated in the opposite direction

The images are borrowed from the "bible" of Chemistry: College Chemistry (2nd edition) from Linus Pauling