Question

Which change increases the electric force between objects? Two neutral objects are moved closer together. Electrons are added to two negatively charged objects. Two oppositely charged objects are moved farther apart. The charge on two positively charged objects is reduced.

Answer 1

When electrons are added to two negatively charged objects,
the repelling force between them increases. 

Answer 2

Answer:

Electrons are added to two negatively charged objects

Explanation:

The electrical force between two charges can be determined by Coulomb's law:

F = kq₁q₂/r²

where,

F = Electric Force

q₁ = magnitude of first charge

q₂ = magnitude of second charge

r = distance between charges

So, it is clear from this formula that the electric force can be increased by increasing the magnitude of charge or by decreasing the distance between them.

In first case, where two neutral charges are moved closer, the force will be zero because charge is zero on neutral surface.

In second case the force will increase due, increase in charge, by addition of electrons.

In third case force will decrease due to increase in distance

In fourth case force will decrease due to reduction in magnitude of charge.

Hence, the correct answer is:

Electrons are added to two negatively charged objects