Answer:
The new electrostatic force will be half the initial force.
Step-by-step explanation:
Let is call the charges of the two objects
and
, if the separation between them is
, then the electrostatic force
between them will be

where
is the coulomb's constant.
If let's say the charge
is halved, then it becomes
. The electrostatic force then becomes


Thus, the new electrostatic force will be half the initial force.