Answer:

Step-by-step explanation:
A) First we will perform the exercise for the 1m radius sphere.
The key is to understand the electric potential of the sphere as well



Understanding that,

Where,


Clearing q of the electric potential equation,

So,


While for the second sphere


B) It is not entirely true, by obtaining a difference of one tenth, it is possible to understand that the larger the diameter, the greater the voltage reached.