Answer:
The Avogadro's Number will reduce in value
Explanation:
From the question we are told that
The current pass through the short circuit is 
Here I is the total current
Generally Avogadro's Number is mathematically represented as

Here Q is the charge which is mathematically represented as

n is number of moles
e is the charge on an electron
So

Now when the current decreases from 100% to 90% due to the short circuit . this will also reduce the no of moles of metal dissolved hence from the equation we see that the Avogadro's Number will reduce