We will have the following:

So, the force is approximately 1.85*10^-6 N.
No. The correct one would be D .
Answer:
The total charge Q of the sphere is
.
Explanation:
Given that,
Radius = 5 cm
Charge density 
We need to calculate the total charge Q of the sphere
Using formula of charge

Where,
= charge density
V = volume
Put the value into the formula

Put the value into the formula


Hence, The total charge Q of the sphere is
.
Its larger and if u where wondering to positive ions are smaller
i believe it's C but i'm not completely sure