Two identical spheres carry charges of +0.6 coulomb and -0.2 coulomb, respectively. if these spheres touch, the resulting charge on the first sphere will be

1. +0.8 c 2. +0.2 c 3. -0.3 c 4. +0.4 c

2. +0.2 C

Explanation:

When the two spheres touch, the total charge will be redistributed such that the two spheres are at same potential:

The potential can be rewritten as ratio between the charge on the sphere (Q) and the capacitance of the sphere (C):

Since the two spheres are identical, they have same capacitance:

So we can write

And since the total charge is

And this charge will be redistributed equally on the two spheres (), we have

what is the question because that is not a question.