How can I solve these to get my answer?

0.863333

86%

hope this

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

3. dark matter

empty space could also be a simple vacuum