Solve -3C, 8C, 4C Electrostatics Problem

[logearav]

Homework Statement

three small identical balls have charges -3C,8C and 4C respectively. they are brought in contact and separated. calculate charge on each ball?

Homework Equations

q=(q1+q2+q3)/3

The Attempt at a Solution

what is the need for dividing by 3. why not simply add the charges q1+q2+q3

 

[Doc Al]

what is the need for dividing by 3. why not simply add the charges q1+q2+q3

That would give you the total charge, not the charge per ball.

 

[logearav]

sir, it has already been mentioned about the charge possessed by each individual ball. When they come in contact some redistribution of charge occurs. if they are separated won't they get their initial charges?

 

[Doc Al]

if they are separated won't they get their initial charges?

No, why would they? They retain no "memory" of their initial charges.

Here's an example that might make it clear. Imagine two identical balls, with charges of +5 and -5 units. When brought together the charge redistributes, adding to zero. There's no longer a charge on the balls, they are neutral. If you had two uncharged balls together, would you expect them to gain a charge as they are separated?

 

[logearav]

Thanks sir. i understood now