Final answer:
The question addresses the calculation of force between two electrically charged particles using Coulomb's law, which involves the strength of charges and the distance between them in the field of physics.
Step-by-step explanation:
The student's question is related to the concept of electric charge and the Coulomb's law in the domain of physics, specifically dealing with electrostatics. When the student refers to a point charge of 4.8 mc, it seems they are mentioning a charge of 4.8 microcoulombs (µC). Coulomb's law is used to calculate the electric force between two stationary, electrically charged particles. The formula for Coulomb's law is F = k·|q1*q2|/r², where F is the force between the charges, k is Coulomb's constant (8.9875 x 10⁹ N·m²/C²), q1 and q2 are the quantities of the charges, and r is the distance between the centers of the two charges. For instance, given two charges and the force exerted by these charges, one can calculate the value of an unknown charge using algebraic manipulation of Coulomb's law.