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

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this