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Answer 1 · 2018-01-11T20:28:51

#"please see the fallowing details."#

We firstly should remember the law of Coulomb.
Coulomb's law states that electrical charges apply electrical force to each other.
#F=k*(q_1*q_2)/(r^2)#
#"where ; "q_1,q_2 " are charges,"#
#"r distance between " q_1 and q_"#
#k:"constant."#
If the electrical charges have the same sign , then electrical charges push each other.
If the electrical charges have the opposite sign , then electrical charges pull each other.
The magnitude of the force exerted by A on B has shown in figure.

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The magnitude of the force acted by B on A is the same but this force has opposite direction.

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