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

Let us consider two charges  q and q' separated by a distance r in a medium.

Hence the force of attraction or repulsion according to Coulomb's law is -

Here is the permitivity of medium.

                        Here we see that   and

Here the medium is same and and separation distance is same.

option-1 q and q' are positive in nature

Here we are adding same number of electrons to  q and q'.Hence the magnitude of charge in both the cases will be decreased. So there is a decrease in the magnitude of force.

option -2 q and q' are negative in nature.

Here we are adding same number of electrons to q and q'. Hence the magnitude of charge is increased.So magnitude of force is increased.

option-3 q and q' are neutral.

Here both q and q' gains charge. Hence they will exert a force on each other.

Option -4 q is positive and q' is negative.

Here q  loses charge while q'gains same amount of charge.Hence the magnitude force will remain same.

Hence option 1 is right.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.