Two identical isolated conducting spheres are picked for an experiment. only one of them is charged. if the spheres are now briefly brought into contact and then separated by a small distance, the two spheres would experience
a) a force of repulsion, because they are like-charged.
b) a force of attraction, because they are oppositely charged.
c) no force, because charges are not transferred by mere contact.
d) no force, because the distance separating the spheres needs to be large.