Electric force between charged balls after contact

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danish1991
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1. A student is performing an experiment with two identical small metal balls, A and B. Initially, Ball A contains 6.0-uC net charge with unknown sign and Ball B is neutral. The student brings them in contact and then separated them by 20cm. Both of the balls are remained isolated. Is the electric force between A and B attractive, repulsive or zero?
Please help!
 

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hi danish1991! welcome to pf! :wink:

what happens to the charge when the metal balls are in contact?

tell us what you think, and why, and then we'll comment! :smile:​
 
Okay, thanks for replying! Its either between repulsive or zero. It cannot be attractive since both charges aren't opposite. I know its repulsive as the correct answer but wouldn't it be zero since ball b is neutral charged and ball a is positive because for attractive both charges got to be opposite to each other, repulsive they got to be same since its positive and zero how would it be repulsive?
 
tiny-tim said:
hi danish1991! welcome to pf! :wink:

what happens to the charge when the metal balls are in contact?

tell us what you think, and why, and then we'll comment! :smile:​
Okay, thanks for replying! Its either between repulsive or zero. It cannot be attractive since both charges aren't opposite. I know its repulsive as the correct answer but wouldn't it be zero since ball b is neutral charged and ball a is positive because for attractive both charges got to be opposite to each other, repulsive they got to be same since its positive and zero how would it be repulsive?
 
hi danish1991! :smile:

(just got up :zzz:)

you haven't answered my question :wink: …
tiny-tim said:
what happens to the charge when the metal balls are in contact?