I think it probably because the steel ship has more surface area then the the marble
hope i helped
To solve this problem we will apply Coulomb's law. For which it tells us that if the charges are constant, the relationship between two forces is equivalent to the inverse of its squared distance. Mathematically this expression can be derived from the Coulomb equation for force:
![F = \frac{kq^2}{r^2}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bkq%5E2%7D%7Br%5E2%7D)
Here,
k = Coulomb's constant
q = Charge
r = Distance
![\frac{F_1}{F_2} = \frac{\frac{kq_1^2}{r_1^2}}{\frac{kq_2^2}{r_2^2}}](https://tex.z-dn.net/?f=%5Cfrac%7BF_1%7D%7BF_2%7D%20%3D%20%5Cfrac%7B%5Cfrac%7Bkq_1%5E2%7D%7Br_1%5E2%7D%7D%7B%5Cfrac%7Bkq_2%5E2%7D%7Br_2%5E2%7D%7D)
![\frac{F_1}{F_2} = \frac{r_2^2}{r_1^2}](https://tex.z-dn.net/?f=%5Cfrac%7BF_1%7D%7BF_2%7D%20%3D%20%5Cfrac%7Br_2%5E2%7D%7Br_1%5E2%7D)
![\frac{F_1}{F_2} = (\frac{r_2}{r_1})^2](https://tex.z-dn.net/?f=%5Cfrac%7BF_1%7D%7BF_2%7D%20%3D%20%28%5Cfrac%7Br_2%7D%7Br_1%7D%29%5E2)
Under the considerations of the statement we have to
![F_1 = 0.245N](https://tex.z-dn.net/?f=F_1%20%3D%200.245N)
![r_2= \frac{r_1}{4}](https://tex.z-dn.net/?f=r_2%3D%20%5Cfrac%7Br_1%7D%7B4%7D)
Now replacing,
![\frac{0.245}{F_2} = (\frac{r_1/4}{r_1})^2](https://tex.z-dn.net/?f=%5Cfrac%7B0.245%7D%7BF_2%7D%20%3D%20%28%5Cfrac%7Br_1%2F4%7D%7Br_1%7D%29%5E2)
![F_2 = \frac{0.245}{(1/4)^2}](https://tex.z-dn.net/?f=F_2%20%3D%20%5Cfrac%7B0.245%7D%7B%281%2F4%29%5E2%7D)
![F_2 = 3.92N](https://tex.z-dn.net/?f=F_2%20%3D%203.92N)