metal sphere A has 4 units of negative charge and metal sphere B has 2 units of positive charge. The two spheres are brought into contact. What is the final charge state of each sphere

Each sphere has 1 unit of positive charge

Explanation:

When the spheres are in contact between them, the charges search an equilibrium distribution in both spheres.

This means that the charges of the sphere with more charge pass to the other sphere until the net chrage of both spheres reaches a minimum.

Then, 2 units of negative charge will neutralize the 2 unit of positive charge of the second sphere. The others 2 units of negative charge of the first sphere will distribute in both spheres.

Hence, one unit negative charge pass to the second sphere.

At the end of the process, each sphere has 1 unit of positive charge.

divide the right side by the left side

0.024÷1.2=0.02 for example