Answer:
Explanation:
Case I: They have same charge. 
Charge on each sphere = q 
Distance between them, d = 14.8 cm = 0.148 m 
Repulsive force, F = 0.235 N 
Use Coulomb's law in electrostatics 

By substituting the values


Thus, the charge on each sphere is  .
.
Case II: 
Charge on first sphere = 4q
Charge on second sphere = q
distance between them, d = 0.148 m 
Force between them, F = 0.235 N
Use Coulomb's law in electrostatics 

By substituting the values


Thus, the charge on second sphere is  and the charge on first sphere is
 and the charge on first sphere is  .
.