Breaking the chain of charges

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
I am not sure how to proceed with the given problem. I can write down the net force on any of the charges but what should be the condition that the chain breaks? :confused:

Any help is appreciated. Thanks!

Attached Images
File Type: png chain of charges.png (11.3 KB)

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