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for the first part I said 200=kq/r and 150 =kq/(r+0.1) to solve for r=0.3m I then input this in and solved for q=6.67x10^-9C

For the second part I said 210=kq/r and 400=q/(4pi(r+0.1)^2) and get r=-0.1 which cannot be right! help would be appreciated thanks