Appending to href of set of anchors

Appending to href of set of anchors

I'm sure the answer to this question has to do with iterating over each element in the wrapped set, but I still don't understand why.
 
I have a number of anchors in my page that have a class named Get.
I want to append a querystring name value pair to the end of each href.
 
$(
'.Get' ).attr( 'href' ).append( '&id=' + id);
 
does not work.  Can someone tell me why and what is the correct solution.
 
Thanks