A way if field A = x than field B only contain positive numbers?

Hello, is there a way that if field A = x than field B can only contain positive numbers? Thanks!

 This is how you can do that:

1) Add fields that will act as A and B:

As you can see I added one text field (for A) and one number field (for B):

2) I added this condition:

So the B field will show when in A you enter x.

3) The important part is that B field accepts only positive numbers:

You can check how it works here: https://form.jotform.com/81455112151950

Let us know how it works.

Thank you!