For which pair of objects would adding the same amount of electrons to each object result in a decrease in the electric force? a. two positively charged objects b. two negatively charged objects c. two objects that have no charge d. two objects that have opposite charges

a. two positively charged objects

Explanation:

The two positively charged objects interact by a repulsive electric force. They repel each other because they have the same positive charge. If we add the same amount of electrons (negative charge) to both objects, we will reduce the positive charge of each object in the same extent. Accordingly, the repulsive electric force would be reduced.

a. two positively charged objects

Explanation:

The electric force is calculated by Columb's law:

F = K*|Q1*Q2|/d²

Where K is the electrostatic constant, Q1 and Q2 are the charges of the objects, and d is the distance between then. The signal "| |" represents the value without the signal.

Thus, if the distance stays equal, the value of |Q1*Q2| must decrease to the force decrease. The electron has a negative charge, so, when it is added to an object positively charged, the total charge will decrease, and when it is added to a negatively charged object, the total charged will increase. Besides, adding it to a neutral object, the module still increasing.

Thus, only adding the electron at the two positively charged objects will result in a decrease in the electric force.

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